Gonzalo Vallejo Fernandez

Search results

• 2024

  Anisotropy constant of antiferromagnetic Pt50Mn50

  Frost, W. J., Carpenter, R. & Vallejo Fernandez, G., 13 Feb 2024, In: Journal of Physics D: Applied Physics. 57, 10 p., 185003.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• Influence of composition on the magnetisation reversal of IrMn/CoFe exchange bias systems

  Carter, A., Jaiswal, S., Campiglio, P. & Vallejo Fernandez, G., 15 May 2024, In: Journal of Magnetism and Magnetic Materials. 598, 172035.

  Research output: Contribution to journal › Article › peer-review

  Open Access

• Towards MnN as a replacement for IrMn

  Frost, W. J., Alsaud, F., Lawrence, R. A., Probert, M. & Vallejo Fernandez, G., 20 Sept 2024, In: Scientific Reports. 14, 8 p., 21944.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• 2023

  Distributions of easy axes and reversal processes in patterned MRAM arrays

  Frost, W. J., Carpenter, R., Couet, S., O'Grady, K. D. & Vallejo Fernandez, G., 22 Nov 2023, In: Scientific Reports. 13, 9 p., 20490.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• 2022

  Development of a variable frequency, low current, low volume hysteresis loop tracer

  Clarke, D. & Vallejo Fernandez, G., 9 Mar 2022, (E-pub ahead of print) In: Journal of Magnetism and Magnetic Materials. 552, 7 p., 169249.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• Effect of the distribution of anisotropy constants on the magnetic properties of iron oxide nanoparticles

  Clarke, D., Marquina, C., Lloyd, D. & Vallejo Fernandez, G., 1 Oct 2022, In: Journal of Magnetism and Magnetic Materials. 559, 5 p., 169543.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• 2021

  Growth and Characterisation of Antiferromagnetic Ni2MnAl Heusler Alloy Films

  Huminiuc, T., Whear, O., Vick, A. J., Lloyd, D., Vallejo Fernandez, G., O'Grady, K. D. & Hirohata, A., 13 Sept 2021, In: Magnetochemistry. 7, 9, 8 p., 127.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• Recent developments on MnN for spintronic applications

  Vallejo Fernandez, G. & Meinert, M., 11 Aug 2021, In: Magnetochemistry. 7, 8, 10 p., 116.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• 2020

  Anisotropy in antiferromagnets

  O'Grady, K. D., Sinclair, J., Elphick, K., Carpenter, R., Vallejo Fernandez, G., Probert, M. & Hirohata, A., 22 Jul 2020, In: Journal of Applied Physics. 128, 4, 11 p., 040901.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• The role of faceting and elongation on the magnetic anisotropy of magnetite Fe₃O₄ nanocrystals

  Moreno, R., Poyser, S., Meilak, D., Meo, A., Jenkins, S., Lazarov, V. K., Vallejo-Fernandez, G., Majetich, S. & Evans, R. F. L., 17 Feb 2020, In: Scientific Reports. 10, 2722 (2020).

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• 2019

  Perpendicular Exchange Bias in (Co/Pt)_n Multilayers

  Elphick, K., O'Grady, K. D. & Vallejo Fernandez, G., 23 Jan 2019, In: IEEE Transactions on Magnetics. 55, 6 p., 4800106.

  Research output: Contribution to journal › Article › peer-review

• Thermal stability of exchange bias systems based on MnN

  Sinclair, J., Hirohata, A., Vallejo Fernandez, G., Meinert, M. & O'Grady, K. D., 15 Apr 2019, In: Journal of Magnetism and Magnetic Materials. 476, p. 278-283 6 p.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• 2018

  Growth and characterisation of ferromagnetic and antiferromagnetic Fe _2+xV _yAl Heusler alloy films

  Huminiuc, T., Whear, O. S., Takahashi, T., Kim, J-Y., Vick, A. J., Vallejo Fernandez, G., O'Grady, K. D. & Hirohata, A., 13 Jul 2018, In: Journal of Physics D: Applied Physics. 51, 32, 5 p., 325003.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• Large exchange bias induced by polycrystalline Mn3Ga antiferromagnetic films with controlled layer thickness

  Wu, H., Sudoh, I., Xu, R., Si, W., Vaz, C., Kim, J-Y., Vallejo Fernandez, G. & Hirohata, A., 12 Apr 2018, In: Journal of Physics D: Applied Physics. 51, 8 p., 215003.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• Spontaneous exchange bias formation driven by a structural phase transition in the antiferromagnetic material

  Migliorini, A., Kuerbanjiang, B., Huminiuc, T., Kepaptsoglou, D., Muñoz, M., Cuñado, J. L. F., Camarero, J., Aroca, C., Vallejo-Fernández, G., Lazarov, V. K. & Prieto, J. L., 1 Jan 2018, In: Nature Materials. 17, 1, p. 28-35 8 p.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• 2017

  A Comparative Measurement Technique for Magnetic Hyperthermia in Nanoparticle Suspensions

  Drayton, A., Zehner, J., Timmis, J., Patel, V., Vallejo Fernandez, G. & O'Grady, K. D., 2017, In: Journal of Physics D: Applied Physics. 50, 495003.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• Development of Antiferromagnetic Heusler Alloys for the Replacement of Iridium as a Critically Raw Material

  Hirohata, A., Huminiuc, T., Sinclair, J., Wu, H., Samiepour, M., Vallejo Fernandez, G., O'Grady, K. D., Balluff, J., Meinert, M., Reiss, G., Simon, E., Khmelevskyi, S., Szunyogh, L., Yanes Díaz, R., Nowak, U., Tsuchiya, T., Sugiyama, T., Kubota, T., Takanashi, K., Inami, N., & 1 othersOno, K., 27 Sept 2017, (E-pub ahead of print) In: Journal of Physics D: Applied Physics. 50, p. 1-15 15 p., 443001.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• Magnetic and structural properties of antiferromagnetic Mn2VSi alloy films grown at elevated temperatures

  Wu, H., Vallejo Fernandez, G. & Hirohata, A., 23 Aug 2017, In: Journal of Physics D: Applied Physics. 50, 37, 375001.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• Measurement of the distribution of anisotropy constants in magnetic nanoparticles for hyperthermia applications

  McGhie, A., Marquina, C., O'Grady, K. D. & Vallejo Fernandez, G., 16 Oct 2017, In: Journal of Physics D: Applied Physics. 50, 6 p., 455003.

  Research output: Contribution to journal › Article › peer-review

  Open Access

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• 2014

  Coercivity and interfacial spin clusters in exchange bias systems

  Carpenter, R., Cramp, N. C., Vallejo Fernandez, G. & O'Grady, K. D., 2014, In: Journal of the Magnetics Society of Japan. 38, p. 61-65 1402R005 .

  Research output: Contribution to journal › Article › peer-review

• Domain wall pinning for racetrack memory using exchange bias

  Polenciuc, I., Vick, A. J., Allwood, D., Hayward, T. J., Vallejo Fernandez, G., O'Grady, K. D. & Hirohata, A., 21 Oct 2014, In: Applied Physics Letters. 105, 16, 5 p., 162406.

  Research output: Contribution to journal › Article › peer-review

• Effect of grain cutting in exchange biased nano Structures

  Carpenter, R., Vick, A. J., Hirohata, A., Vallejo Fernandez, G. & O'Grady, K. D., 2014, In: Journal of Applied Physics. 115, 17B905.

  Research output: Contribution to journal › Article › peer-review

• Heusler alloys in magnetic recording

  Hirohata, A., Vallejo Fernandez, G., O'Grady, K. D., Reiss, G., Nowak, U., Szunyogh, L., Takanashi, K. & Ono, K., 2014, Magnetics technology international, 82, p. 82-86.

  Research output: Contribution to specialist publication › Article

• Interfacial spin cluster effects in exchange bias systems

  Carpenter, R., Vallejo Fernandez, G. & O'Grady, K. D., 7 May 2014, In: Journal of Applied Physics. 115, 17, 17D715.

  Research output: Contribution to journal › Article › peer-review
• 2013

  Control and analysis of grain size in sputtered NiFe thin films

  Vallejo Fernandez, G., Grundy, P. J. & Vopson, M., 2013, In: Journal of Condensed Matter Physics. 1, 1, p. 6-9

  Research output: Contribution to journal › Article › peer-review

• Effect of the distribution of anisotropy constants on hysteresis losses for magnetic hyperthermia applications

  Vallejo Fernandez, G. & O'Grady, K. D., 2013, In: Applied Physics Letters. 103, 14, 4 p., 142417.

  Research output: Contribution to journal › Article › peer-review

• Magnetic hyperthermia for tumour reduction

  Vallejo Fernandez, G., Whear, O., Roca, A. G., Hussain, S., Patel, V. & O'Grady, K. D., 2013, Europhysics News, 44, 6, p. 18 1 p.

  Research output: Contribution to specialist publication › Article

• Mechanisms of hyperthermia in magnetic nanoparticles

  Vallejo Fernandez, G., Whear, O., G Roca, A., Hussain, S., Timmis, J., Patel, V. & O'Grady, K. D., 7 Aug 2013, In: Journal of Physics D: Applied Physics. 46, 31, p. 1-6 6 p., 312001.

  Research output: Contribution to journal › Article › peer-review
• 2012

  Effect of Frequency and Field Amplitude in Magnetic Hyperthermia

  Roca, A. G., Wiese, B., Timmis, J., Vallejo-Fernandez, G. & O'Grady, K., Nov 2012, In: IEEE Transactions on Magnetics. 48, 11, p. 4054-4057 4 p., 6332604.

  Research output: Contribution to journal › Article › peer-review
• 2011

  An Analysis of Minor Hysteresis Loops of Nanoparticles for Hyperthermia

  Roca, A. G., Vallejo Fernandez, G. & O'Grady, K., Oct 2011, In: IEEE Transactions on Magnetics. 47, 10, p. 2878-2881 4 p., 6027829.

  Research output: Contribution to journal › Article › peer-review

• Defect and impurity effects in exchange bias systems

  Vallejo Fernandez, G., Kaeswurm, B. & O'Grady, K., 1 Apr 2011, In: Journal of Applied Physics. 109, 7, p. 1-3 3 p., 07D738.

  Research output: Contribution to journal › Article › peer-review

• Effect of Non-Magnetic Dilutions on the Blocking temperature of Exchange Biased Systems

  Vallejo Fernandez, G. & O'Grady, K., Oct 2011, In: IEEE Transactions on Magnetics. 47, 10, p. 3304-3307 4 p., 6028179.

  Research output: Contribution to journal › Article › peer-review

• Medipix2 as a highly flexible scanning/imaging detector for transmission electron microscopy

  Mac Raighne, A., Fernandez, G. V., Maneuski, D., McGrouther, D. & O'Shea, V., Jan 2011, In: Journal of Instrumentation. 6, 1, p. - 7 p., C01047.

  Research output: Contribution to journal › Article › peer-review
• 2010

  A new paradigm for exchange bias in polycrystalline thin films

  O'Grady, K., Fernandez-Outon, L. E. & Vallejo Fernandez, G., Apr 2010, In: Journal of Magnetism and Magnetic Materials. 322, 8, p. 883-899 17 p.

  Research output: Contribution to journal › Article › peer-review

• Cotunneling enhancement of magnetoresistance in double magnetic tunnel junctions with embedded superparamagnetic NiFe nanoparticles

  Dempsey, K. J., Hindmarch, A. T., Wei, H. -X., Qin, Q. -H., Wen, Z. -C., Wang, W. -X., Vallejo-Fernandez, G., Arena, D. A., Han, X. -F. & Marrows, C. H., 13 Dec 2010, In: Physical Review B. 82, 21, p. - 8 p., 214415.

  Research output: Contribution to journal › Article › peer-review

• Measurement of the antiferromagnet activity in exchange bias systems

  Vallejo Fernandez, G., Deakin, T., O'Grady, K., Oh, S., Leng, Q. & Pakala, M., 1 May 2010, In: Journal of Applied Physics. 107, 9, p. - 3 p., 09D709.

  Research output: Contribution to journal › Article › peer-review

• Measurement of the attempt frequency in antiferromagnets

  Vallejo Fernandez, G., Aley, N. P., Chapman, J. N. & O'Grady, K., 29 Nov 2010, In: Applied Physics Letters. 97, 22, p. - 3 p., 222505.

  Research output: Contribution to journal › Article › peer-review

• Thermal stability of exchange bias nanostructures

  Vallejo-Fernandez, G. & Chapman, J. N., 1 May 2010, In: Journal of Applied Physics. 107, 9, p. - 3 p., 09D704.

  Research output: Contribution to journal › Article › peer-review
• 2009

  Size effects in submicron exchange bias square elements

  Vallejo-Fernandez, G. & Chapman, J. N., 29 Jun 2009, In: Applied Physics Letters. 94, 26, p. 1-3 3 p., 262508.

  Research output: Contribution to journal › Article › peer-review
• 2008

  Antiferromagnetic grain volume effects in metallic polycrystalline exchange bias systems

  Vallejo Fernandez, G., Fernandez-Outon, L. E. & O'Grady, K., 7 Jun 2008, In: Journal of Physics D: Applied Physics. 41, 11, p. 1-5 5 p., 112001.

  Research output: Contribution to journal › Article › peer-review

• Control of the setting process in CoFe/IrMn exchange bias systems

  Vallejo Fernandez, G., Aley, N. P., Fernandez-Outon, L. E. & O'Grady, K., 1 Aug 2008, In: Journal of Applied Physics. 104, 3, p. 1-5 5 p., 033906.

  Research output: Contribution to journal › Article › peer-review

• Effect of the Ferromagnetic Layer Thickness on the Blocking Temperature in IrMn/CoFe Exchange Couples

  Vallejo Fernandez, G., Kaeswurm, B., Fernandez-Outon, L. E. & O'Grady, K., Nov 2008, In: IEEE Transactions on Magnetics. 44, 11, p. 2835-2838 4 p.

  Research output: Contribution to journal › Article › peer-review

• Factors affecting exchange bias in polycrystalline metallic thin films”, L. E. Fernandez-Outon

  Fernandez-Outon, L. E., Vallejo Fernandez, G. & O'Grady, K. D., 2008, In: MRS Proceedings. 1032, I03-03.

  Research output: Contribution to journal › Article › peer-review

• Interfacial spin effects on H-ex in metallic polycrystalline exchange biased systems

  Fernandez-Outon, L. E., Vallejo-Fernandez, G. & O'Grady, K., 1 Apr 2008, In: Journal of Applied Physics. 103, 7, p. - 3 p., 07C106.

  Research output: Contribution to journal › Article › peer-review

• Interfacial spin order in exchange biased systems

  Fernandez-Outon, L. E., Vallejo Fernandez, G., Manzoor, S., Hillebrands, B. & O'Grady, K., 1 Nov 2008, In: Journal of Applied Physics. 104, 9, p. 1-7 7 p., 093907.

  Research output: Contribution to journal › Article › peer-review

• Texture Effects in IrMn/CoFe Exchange Bias Systems

  Aley, N. P., Vallejo Fernandez, G., Kroger, R., Lafferty, B., Agnew, J., Lu, Y. & O'Grady, K., Nov 2008, In: IEEE Transactions on Magnetics. 44, 11, p. 2820-2823 4 p.

  Research output: Contribution to journal › Article › peer-review

• Thermal activation of bulk and interfacial order in exchange biased systems

  Vallejo-Fernandez, G., Fernandez-Outon, L. E. & O'Grady, K., 1 Apr 2008, In: Journal of Applied Physics. 103, 7, p. - 3 p., 07C101.

  Research output: Contribution to journal › Article › peer-review
• 2007

  Annealing effect on thermal stability and microstructure in IrMn/Co60Fe20B20 bilayers

  Vallejo Fernandez, G., Dimopoulos, T., Ruehrig, M. & O'Grady, K., Mar 2007, In: Journal of Magnetism and Magnetic Materials. 310, 2, p. E769-E771 3 p.

  Research output: Contribution to journal › Article › peer-review

• Bulk and interfacial effects in exchange bias systems

  Dutson, J. D., Hueerich, C., Yi, G., Mao, S., Chantrell, R. W., O'Grady, K., Vallejo Fernandez, G. & Fernandez-Outon, L. E., Mar 2007, In: Journal of Physics D: Applied Physics. 40, 5, p. 1293-1299 6 p.

  Research output: Contribution to journal › Article › peer-review

• Measurement of the anisotropy constant of antiferromagnets in metallic polycrystalline exchange biased systems

  Vallejo Fernandez, G., Fernandez-Outon, L. E. & O'Grady, K., 19 Nov 2007, In: Applied Physics Letters. 91, 21, 3 p., 212503.

  Research output: Contribution to journal › Article › peer-review