Anisotropy in antiferromagnets

Kevin Dermot O'Grady; John Sinclair; Kelvin Elphick; Robert Carpenter; Gonzalo Vallejo Fernandez; Matt Probert; Atsufumi Hirohata

doi:10.1063/5.0006077

Anisotropy in antiferromagnets

Kevin Dermot O'Grady, John Sinclair, Kelvin Elphick, Robert Carpenter, Gonzalo Vallejo Fernandez, Matt Probert, Atsufumi Hirohata

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

Abstract

Due to the advent of antiferromagnetic (AF) spintronics there is a burgeoning interest in AF materials for a wide range of potential and actual applications. Generally, AFs are characterized via the ordering at the Néel temperature (TN) but, to have a stable AF configuration, it is necessary that the material have a sufficient level of anisotropy so as to maintain the orientation of the given magnetic state fixed in one direction. Unlike the case for ferromagnets there is little established data on the anisotropy of AFs and in particular its origins, other than it being magneto-crystalline, and those factors which control it. In this perspective article these factors are reviewed in the light of recent and established experimental data. The anisotropy can be found indirectly via the exchange bias phenomenon. This technique is reviewed and in particular the implications for the nature of the anisotropy that is measured and its distribution. Finally, a strategy is proposed that would allow for the development of AF materials with controlled anisotropy for future applications.

Original language	English
Article number	040901
Number of pages	11
Journal	Journal of Applied Physics
Volume	128
Issue number	4
DOIs	https://doi.org/10.1063/5.0006077 https://doi.org/10.1063/5.0006077
Publication status	Published - 22 Jul 2020

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Cite this

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title = "Anisotropy in antiferromagnets",

abstract = "Due to the advent of antiferromagnetic (AF) spintronics there is a burgeoning interest in AF materials for a wide range of potential and actual applications. Generally, AFs are characterized via the ordering at the N{\'e}el temperature (TN) but, to have a stable AF configuration, it is necessary that the material have a sufficient level of anisotropy so as to maintain the orientation of the given magnetic state fixed in one direction. Unlike the case for ferromagnets there is little established data on the anisotropy of AFs and in particular its origins, other than it being magneto-crystalline, and those factors which control it. In this perspective article these factors are reviewed in the light of recent and established experimental data. The anisotropy can be found indirectly via the exchange bias phenomenon. This technique is reviewed and in particular the implications for the nature of the anisotropy that is measured and its distribution. Finally, a strategy is proposed that would allow for the development of AF materials with controlled anisotropy for future applications.",

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AU - O'Grady, Kevin Dermot

AU - Sinclair, John

AU - Elphick, Kelvin

AU - Carpenter, Robert

AU - Vallejo Fernandez, Gonzalo

AU - Probert, Matt

AU - Hirohata, Atsufumi

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AB - Due to the advent of antiferromagnetic (AF) spintronics there is a burgeoning interest in AF materials for a wide range of potential and actual applications. Generally, AFs are characterized via the ordering at the Néel temperature (TN) but, to have a stable AF configuration, it is necessary that the material have a sufficient level of anisotropy so as to maintain the orientation of the given magnetic state fixed in one direction. Unlike the case for ferromagnets there is little established data on the anisotropy of AFs and in particular its origins, other than it being magneto-crystalline, and those factors which control it. In this perspective article these factors are reviewed in the light of recent and established experimental data. The anisotropy can be found indirectly via the exchange bias phenomenon. This technique is reviewed and in particular the implications for the nature of the anisotropy that is measured and its distribution. Finally, a strategy is proposed that would allow for the development of AF materials with controlled anisotropy for future applications.

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