Dr Trevor Almeida

Lecturer in Materials and Condensed Matter Physics (Physics & Astronomy)

telephone: 01413304712
email: Trevor.Almeida@glasgow.ac.uk

Room 308, Kelvin Building, Materials and Condensed Matter Group, School of Physics and Astronomy, University of Glasgow, G12 8QQ

Import to contacts

https://orcid.org/0000-0003-4683-6279

Research interests

My primary research interests are directed towards the processing, structure and functional properties of nanostructured materials. I have acquired much experience in the growth and characterisation of magnetic nanostructures using a range of techniques, with a special interest in transmission electron microscopy (TEM). In particular, I focus on the use of Lorentz microscopy methods like differential phase contrast imaging and off-axis electron holography for visualising magnetic induction within nanostructures; and combining magnetic imaging with in situ TEM experiments to examine their magnetisation as a function of chemical alteration, electrical biasing and heating.

researcherID: N-6572-2015

Publications

Selected publications

Almeida, T. P. , Lequeux, S., Palomino, A., Sousa, R. C., Fruchart, O., Prejbeanu, I.-L., Dieny, B., Masseboeuf, A. and Cooper, D. (2022) Quantitative visualization of thermally enhanced perpendicular shape anisotropy STT-MRAM nanopillars. Nano Letters, 22(10), pp. 4000-4005. (doi: 10.1021/acs.nanolett.2c00597) (PMID:35576455)

Almeida, T. P. , McGrouther, D. , Temple, R., Massey, J., Li, Y., Moore, T., Marrows, C. H. and McVitie, S. (2020) Direct visualization of the magnetostructural phase transition in nanoscale FeRh thin films using differential phase contrast imaging. Physical Review Materials, 4(3), 034410. (doi: 10.1103/PhysRevMaterials.4.034410)

Shah, J. et al. (2018) The oldest magnetic record in our Solar System identified using nanometric imaging and numerical modeling. Nature Communications, 9, 1173. (doi: 10.1038/s41467-018-03613-1) (PMID:29563498) (PMCID:PMC5862876)

Almeida, T. P. , Muxworthy, A. R., Kovács, A., Williams, W., Brown, P. D. and Dunin-Borkowski, R. E. (2016) Direct visualization of the thermomagnetic behavior of pseudo-single-domain magnetite particles. Science Advances, 2(4), e1501801. (doi: 10.1126/sciadv.1501801)

Almeida, T. P. , Kasama, T., Muxworthy, A. R., Williams, W., Nagy, L., Hansen, T. W., Brown, P. D. and Dunin-Borkowski, R. E. (2014) Visualized effect of oxidation on magnetic recording fidelity in pseudo-single-domain magnetite particles. Nature Communications, 5, 5154. (doi: 10.1038/ncomms6154) (PMID:25300366) (PMCID:PMC4214405)

All publications

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Jump to: 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2010 | 2009 | 2008

Number of items: 57.

2024

Okasha, S. and Almeida, T. (2024) Characterization of alane (AlH3) thin films grown by atomic layer deposition for hydrogen storage applications. Applied Surface Science, 672, 160840. (doi: 10.1016/j.apsusc.2024.160840)

Barker, C. E. A. et al. (2024) Phase coexistence and transitions between antiferromagnetic and ferromagnetic states in a synthetic antiferromagnet. Physical Review B, 109, 134437. (doi: 10.1103/PhysRevB.109.134437)

2023

Jalil, W., Dugato, D., Almeida, T. , Cooper, D. and Garcia, F. (2023) Self-supported 3D vortex texture in curved magnets. Journal of Physics D: Applied Physics, 56(38), 385001. (doi: 10.1088/1361-6463/acdaa8)

Niraula, G. et al. (2023) Observation of magnetic vortex configuration in non-stoichiometric Fe3O4 nanospheres. Nanoscale Advances, 5, pp. 5015-5028. (doi: 10.1039/d3na00433c) (PMID:37705767) (PMCID:PMC10496882)

Giron, S. et al. (2023) Towards engineering the perfect defect in high-performing permanent magnets. Research Square, (doi: 10.21203/rs.3.rs-2873882/v1)

2022

Almeida, T. , Palomino, A., Lequeux, S., Boureau, V., Fruchart, O., Prejbeanu, I. L., Dieny, B. and Cooper, D. (2022) Off-axis electron holography for the direct visualization of perpendicular shape anisotropy in nanoscale 3D magnetic random-access-memory devices. APL Materials, 10(6), 061104. (doi: 10.1063/5.0096761)

Almeida, T. , Lequeux, S., Palomino, A., Sousa, R., Fruchart, O., Prejbeanu, I. L., Dieny, B., Masseboeuf, A. and Cooper, D. (2022) Direct observation of the perpendicular shape anisotropy and thermal stability of p-STT-MRAM nano-pillars. arXiv, (Unpublished)

2021

Almeida, T. , Lequeux, S., Palomino, A., Caçoilo, N., Massebouef, A., Sousa, R., Fruchart, O., Prejbeanu, I.-L., Dieny, B. and Cooper, D. (2021) Direct Observation of the Perpendicular Shape Anisotropy and Thermal Stability of STT-MRAM Nano-pillars Examined by Off-axis Electron Holography. Microscopy and Microanalysis 2021 (M&M 2021), 1-5 Aug 2021. (doi: 10.1017/S1431927621007819)

Lequeux, S., Almeida, T. , Caçoilo, N., Palomino, A., Prejbeanu, I. L., Sousa, R. C., Cooper, D. and Dieny, B. (2021) PSA-STT-MRAM Solution for Extended Temperature Stability. In: 2021 IEEE International Memory Workshop (IMW), Dresden, Germany, 16-19 May 2021, ISBN 9781728185170 (doi: 10.1109/IMW51353.2021.9439609)

Temple, R., Rosamond, M. C., Massey, J. R., Almeida, T. P. , Linfield, E. H., McGrouther, D. , McVitie, S. , Moore, T. A. and Marrows, C. H. (2021) Phase domain boundary motion and memristance in gradient-doped FeRh nanopillars induced by spin injection. Applied Physics Letters, 118, 122403. (doi: 10.1063/5.0038950)

2020

Benito, L., Clark, L. , Almeida, T.P. , Moore, T.A., , and , (2020) Sputter-engineering a first-order magnetic phase transition in sub-15-nm-thick single-crystal FeRh films. Physical Review Materials, 4(12), 123402. (doi: 10.1103/PhysRevMaterials.4.123402)

Massey, J. R. et al. (2020) Asymmetric magnetic relaxation behavior of domains and domain walls observed through the FeRh first-order metamagnetic phase transition. Physical Review B, 102(14), 144304. (doi: 10.1103/PhysRevB.102.144304)

Almeida, T. P. , McGrouther, D. , Kovács, A., Dunin-Borkowski, R. E. and McVitie, S. (2020) Effect of annealing on the magnetic states of FEBID-grown cobalt nanopatterns examined by off-axis electron holography. Journal of Microscopy, 279(3), pp. 217-221. (doi: 10.1111/jmi.12869) (PMID:31985824)

2019

Massey, J. R. et al. (2019) Second-order phase transition at the phase boundary through the FeRh first-order metamagnetic phase transition. arXiv, (Unpublished)

Almeida, T. P. , Clark, L. , Temple, R., Massey, J., Moore, T., McGrouther, D. , Marrows, C. H. and McVitie, S. (2019) Differential Phase Contrast Imaging of the Magnetostructural Transition and Phase Boundary Motion in Uniform and Gradient-doped FeRh-based Thin Films. Atom Probe Tomography and Microscopy (APT&M 2018), Gaithersburg, MD, USA, 10-15 Jun 2018. (doi: 10.1017/S1431927619009917)

Almeida, T. P. , McGrouther, D. , Kovács, A., Dunin-Borkowski, R. E. and McVitie, S. (2019) Focused Electron-Beam Induced Deposition, In Situ TEM And Off-Axis Electron Holography Investigation of Bi-Magnetic Core-Shell Nanostructures. Atom Probe Tomography and Microscopy (APT&M 2018), Gaithersburg, MD, USA, 10-15 Jun 2018. (doi: 10.1017/S1431927619001016)

2018

Temple, R.C. et al. (2018) Antiferromagnetic-ferromagnetic phase domain development in nanopatterned FeRh islands. Physical Review Materials, 2(10), 104406. (doi: 10.1103/PhysRevMaterials.2.104406)

Almeida, T. P. , Muxworthy, A. R., Williams, W., Kasama, T., Hansen, T. W., Brown, P. D., Kovács, A. and Dunin-Borkowski, R. E. (2018) Visualized Effects of Oxidation and Temperature on Vortex-State Fe3O4 Particles Examined by Environmental TEM and Off-Axis Electron Holography. Microscopy and Microanalysis (M&M 2018), Baltimore, MD, USA, 05-09 Aug 2018. (doi: 10.1017/S143192761800524X)

Almeida, T. P. , Temple, R., Massey, J., Fallon, K., Paterson, G. , Moore, T., McGrouther, D. , Marrows, C. H. and McVitie, S. (2018) Quantitative Differential Phase Contrast Imaging of the Magnetostructural Transition and Current-driven Motion of Domain Walls in FeRh Thin Films. Microscopy and Microanalysis (M&M 2018), Baltimore, MD, USA, 05-09 Aug 2018. (doi: 10.1017/S1431927618005172)

2017

Almeida, T. P. , Temple, R., Massey, J., Fallon, K., McGrouther, D. , Moore, T., Marrows, C. H. and McVitie, S. (2017) Quantitative TEM imaging of the magnetostructural and phase transitions in FeRh thin film systems. Scientific Reports, 7, 17835. (doi: 10.1038/s41598-017-18194-0) (PMID:29259255) (PMCID:PMC5736605)

Roberts, A. P., Almeida, T. P. , Church, N. S., Harrison, R. J., Heslop, D., Li, Y., Li, J., Muxworthy, A. R., Williams, W. and Zhao, X. (2017) Resolving the origin of pseudo-single domain magnetic behavior. Journal of Geophysical Research: Solid Earth, 122(12), pp. 9534-9558. (doi: 10.1002/2017JB014860)

Almeida, T. P. , McGrouther, D. , Pivak, Y., Perez Garza, H. H., Temple, R., Massey, J., Marrows, C. H. and McVitie, S. (2017) Preparation of high-quality planar FeRh thin films for in situ TEM investigations. Journal of Physics: Conference Series, 903(1), 012022. (doi: 10.1088/1742-6596/903/1/012022)

Prozorov, T., Almeida, T. P. , Kovács, A. and Dunin-Borkowski, R. E. (2017) Off-axis electron holography of bacterial cells and magnetic nanoparticles in liquid. Journal of the Royal Society: Interface, 14(135), 20170464. (doi: 10.1098/rsif.2017.0464) (PMID:29021160)

Nagy, L., Williams, W., Muxworthy, A. R., Fabian, K., Almeida, T. P. , Conbhuí, P. Ó. and Shcherbakov, V. P. (2017) Stability of equidimensional pseudo–single-domain magnetite over billion-year timescales. Proceedings of the National Academy of Sciences of the United States of America, 114(39), pp. 10356-10360. (doi: 10.1073/pnas.1708344114) (PMID:28874562)

Almeida, T. P. , Muxworthy, A. R., Kovács, A., Williams, W. and Dunin-Borkowski, R. E. (2017) Observation of thermally-induced magnetic relaxation in a magnetite grain using off-axis electron holography. Journal of Physics: Conference Series, 902, 012001. (doi: 10.1088/1742-6596/902/1/012001)

2016

Dunin-Borkowski, R. E., Almeida, T. P. , Caron, J., Kovács, A., Diehle, P., Winkler, F., Tavabi, A. H., Migunov, V. and Li, Z.-A. (2016) Limitations and Challenges in Off‐axis Electron Holography of Electromagnetic Fields in Nanoscale Materials. European Microscopy Congress 2016, Lyon, France, 28 Aug - 02 Sep 2016. ISBN 9783527342976 (doi: 10.1002/9783527808465.EMC2016.8663)

Almeida, T. P. , Muxworthy, A. R., Kovács, A., Williams, W., Nagy, L., Conbhuí, P. Ó., Frandsen, C., Supakulopas, R. and Dunin-Borkowski, R. E. (2016) Direct observation of the thermal demagnetization of magnetic vortex structures in nonideal magnetite recorders. Geophysical Research Letters, 43(16), pp. 8426-8434. (doi: 10.1002/2016GL070074)

2015

Abubakar, R., Muxworthy, A.R., Sephton, M.A., Southern, P., Watson, J.S., Fraser, A.J. and Almeida, T.P. (2015) Formation of magnetic minerals at hydrocarbon-generation conditions. Marine and Petroleum Geology, 68(A), pp. 509-519. (doi: 10.1016/j.marpetgeo.2015.10.003)

Almeida, T. P. , Muxworthy, A. R., Kasama, T., Williams, W., Damsgaard, C., Frandsen, C., Pennycook, T. J. and Dunin-Borkowski, R. E. (2015) Effect of maghemization on the magnetic properties of nonstoichiometric pseudo-single-domain magnetite particles. Geochemistry, Geophysics, Geosystems, 16(9), pp. 2969-2979. (doi: 10.1002/2015GC005858)

Almeida, T. P. , Muxworthy, A. R., Kovács, A., Williams, W. and Dunin-Borkowski, R. E. (2015) Visualisation of high temperature magnetisation states in magnetite grains using off-axis electron holography. Journal of Physics: Conference Series, 644, 012027. (doi: 10.1088/1742-6596/644/1/012027)

2014

Almeida, T. P. , Kasama, T., Muxworthy, A. R., Williams, W., Nagy, L. and Dunin-Borkowski, R. E. (2014) Observing thermomagnetic stability of nonideal magnetite particles: good paleomagnetic recorders? Geophysical Research Letters, 41(20), pp. 7041-7047. (doi: 10.1002/2014GL061432)

Almeida, T. P. , Moro, F., Fay, M. W., Zhu, Y. and Brown, P. D. (2014) Tuneable magnetic properties of hydrothermally synthesised core/shell CoFe2O4/NiFe2O4 and NiFe2O4/CoFe2O4 nanoparticles. Journal of Nanoparticle Research, 16, 2395. (doi: 10.1007/s11051-014-2395-1)

Almeida, T. P. , Fay, M. W., Hansen, T. W., Zhu, Y. and Brown, P. D. (2014) Insights from in situ and environmental TEM on the oriented attachment of α-Fe2O3 nanoparticles during α-Fe2O3 nanorod formation. CrystEngComm, 16(8), pp. 1540-1546. (doi: 10.1039/c3ce41866a)

Almeida, T. P. , Muxworthy, A. R., Williams, W., Kasama, T. and Dunin-Borkowski, R. (2014) Magnetic characterization of synthetic titanomagnetites: quantifying the recording fidelity of ideal synthetic analogs. Geochemistry, Geophysics, Geosystems, 15(1), pp. 161-175. (doi: 10.1002/2013GC005047)

Almeida, T. P. , Muxworthy, A. R., Williams, W., Kasama, T. and Dunin-Borkowski, R. E. (2014) Hydrothermal synthesis, off-axis electron holography and magnetic properties of Fe3O4 nanoparticles. Journal of Physics: Conference Series, 522, 012062. (doi: 10.1088/1742-6596/522/1/012062)

Muxworthy, A. R., Krása, D., Williams, W. and Almeida, T. P. (2014) Paleomagnetic recording fidelity of nonideal magnetic systems. Geochemistry, Geophysics, Geosystems, 15(6), pp. 2254-2261. (doi: 10.1002/2014GC005249) (PMID:26300699) (PMCID:PMC4540164)

2013

Xu, F., Almeida, T. P. , Chang, H., Xia, Y., Wears, M. L. and Zhu, Y. (2013) Multi-walled carbon/IF-WS2 nanoparticles with improved thermal properties. Nanoscale, 5(21), pp. 10504-10510. (doi: 10.1039/c3nr03844k) (PMID:24057128)

Almeida, T.P. , Muxworthy, A., Williams, W. and Dunin-Borkowski, R.E. (2013) Oxidation of Pseudo-Single Domain Fe3O4 Particles and Associated Magnetic Response Examined by Environmental TEM and Off-Axis Electron Holography. Microscopy and Microanalysis 2013, Indianapolis, IN, USA, 04-08 Aug 2013. (doi: 10.1017/S1431927613009276)

2012

Almeida, T. P. , Fay, M., Zhu, Y. and Brown, P. D. (2012) Controlling role of pH and temperature on CoFe2O4 nanostructures produced by hydrothermal synthesis. Journal of Nanoscience and Nanotechnology, 12(11), pp. 8801-8805. (doi: 10.1166/jnn.2012.6468) (PMID:23421290)

Almeida, T. P. , Fay, M., Zhu, Y. and Brown, P. D. (2012) Hydrothermal synthesis and near In situ analysis of NiFe2O4 nanoparticles. Journal of Nanoscience and Nanotechnology, 12(11), pp. 8797-8800. (doi: 10.1166/jnn.2012.6467) (PMID:23421289)

Almeida, T. P. , Fay, M. W., Zhu, Y. and Brown, P. D. (2012) Prospects for the incorporation of cobalt into α-Fe2O3 nanorods during hydrothermal synthesis. Journal of Materials Science, 47(14), pp. 5546-5560. (doi: 10.1007/s10853-012-6448-5)

Almeida, T. P. , Fay, M. W., Zhu, Y. and Brown, P. D. (2012) In situ TEM investigation of β-FeOOH and α-Fe2O3 nanorods. Physica E: Low-Dimensional Systems and Nanostructures, 44(6), pp. 1058-1061. (doi: 10.1016/j.physe.2011.01.016)

Almeida, T.P. , Muxworthy, A., Williams, W. and Dunin-Borkowski, R. (2012) Dynamic Exsolution of Titanomagnetites and their Associated Magnetic Response Examined by Complementary Environmental TEM and Off-Axis Electron Holography. European Microscopy Congress 2012, Manchester, UK, 16-21 Sep 2012.

Almeida, T. P. , Fay, M. W., Zhu, Y. and Brown, P. D. (2012) Hydrothermal synthesis of homogeneous and core/shell CoxNi1−xFe2O4 nanoparticles. In: 12th IEEE International Conference on Nanotechnology, Birmingham, England, 20-23 Aug 2012, pp. 1-5. ISBN 9781467321983 (doi: 10.1109/NANO.2012.6322173)

Almeida, T. P. , Fay, M. W., Zhu, Y. and Brown, P. D. (2012) Hydrothermal synthesis of mixed cobalt-nickel ferrite nanoparticles. Journal of Physics: Conference Series, 371, 012074. (doi: 10.1088/1742-6596/371/1/012074)

Almeida, T. P. , Fay, M. W., Zhu, Y., Hansen, T. W., Dunin-Borkowski, R. and Brown, P. D. (2012) Environmental TEM investigation of the reduction of α-Fe2O3 nanorods under H2 atmosphere. Journal of Physics: Conference Series, 371, 012049. (doi: 10.1088/1742-6596/371/1/012049)

2010

Almeida, T. P. , Fay, M. W., Zhu, Y. and Brown, P. D. (2010) Hydrothermal growth mechanism of α-Fe2O3 nanorods derived by near in situ analysis. Nanoscale, 2(11), p. 2390. (doi: 10.1039/c0nr00280a) (PMID:21080566)

Almeida, T. P. , Fay, M. W., Zhu, Y. and Brown, P. D. (2010) A valve-assisted snapshot approach to understand the hydrothermal synthesis of α-Fe2O3 nanorods. CrystEngComm, 12(6), pp. 1700-1704. (doi: 10.1039/b925197a)

Almeida, T. , Fay, M., Zhu, Y. and Brown, P.D. (2010) Effect of phosphate on the morphology of hydrothermally synthesised β-FeOOH and α-Fe2O3 nanoparticles. Journal of Physics: Conference Series, 241(1), 012045. (doi: 10.1088/1742-6596/241/1/012045)

Almeida, T. , Zhu, Y. and Brown, P.D. (2010) Complementary RHEED and XRD investigation of β-FeOOH and α-Fe203 nanoparticles. Journal of Physics: Conference Series, 241(1), 012087. (doi: 10.1088/1742-6596/241/1/012087)

2009

Almeida, T. P. , Fay, M., Zhu, Y. and Brown, P. D. (2009) Process map for the hydrothermal synthesis of α-Fe2O3 nanorods. Journal of Physical Chemistry C, 113(43), pp. 18689-18698. (doi: 10.1021/jp907081j)

2008

Almeida, T. , Zhu, Y.Q. and Brown, P.D. (2008) Hydrothermal Synthesis and Characterisation of Single Crystal α-Fe2O3 Nanorods. European Microscopy Congress 2008, Aachen, Germany, 01-05 Sep 2008. ISBN 9783540852254 (doi: 10.1007/978-3-540-85226-1_147)

This list was generated on Wed Oct 30 23:20:15 2024 GMT.

Jump to: Articles | Conference or Workshop Item | Conference Proceedings

Number of items: 57.

Articles

Giron, S. et al. (2023) Towards engineering the perfect defect in high-performing permanent magnets. Research Square, (doi: 10.21203/rs.3.rs-2873882/v1)

Massey, J. R. et al. (2019) Second-order phase transition at the phase boundary through the FeRh first-order metamagnetic phase transition. arXiv, (Unpublished)

Temple, R.C. et al. (2018) Antiferromagnetic-ferromagnetic phase domain development in nanopatterned FeRh islands. Physical Review Materials, 2(10), 104406. (doi: 10.1103/PhysRevMaterials.2.104406)

Conference or Workshop Item

Conference Proceedings

This list was generated on Wed Oct 30 23:20:15 2024 GMT.

Teaching

Assessment

Physics 2 Literature Review Marking PHYS2001

Laboratories

Physics 1: Laboratory (S1) PHYS1001
Physics 1: Laboratory (S2) PHYS1001

Lectures

Magnetism and Superconductivity PHYS4010
Nano and Atomic Scale Imaging 1 PHYS5041
Nano and Atomic Scale Imaging 2 PHYS5042

Research datasets

Jump to: 2020 | 2018

Number of items: 2.

2020

Almeida, T. , McGrouther, D. , Temple, R., Massey, J., Li, Y., Moore, T., Marrows, C. and McVitie, S. (2020) Direct visualization of the magnetostructural phase transition in nano-scale FeRh thin films using differential phase contrast imaging. [Data Collection]

2018

Temple, R. C., Almeida, T. , Massey, J. R., Fallon, K., Lamb, R., McGrouther, D. , McVitie, S. , Moore, T. A. and Marrows, C. H. (2018) 4D STEM data set supporting “Antiferromagnetic-ferromagnetic phase domain development in nanopatterned FeRh islands”. [Data Collection]

This list was generated on Wed Oct 30 23:20:17 2024 GMT.

Dr Trevor Almeida

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Dr Trevor Almeida

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