Coercivity enhancement above the Néel temperature of an antiferromagnet/ferromagnet bilayer

C. Leighton; H. Suhl; Michael J. Pechan; R. Compton; J. Nogués; Ivan K. Schuller

doi:10.1063/1.1491277

Coercivity enhancement above the Néel temperature of an antiferromagnet/ferromagnet bilayer

C. Leighton, H. Suhl, Michael J. Pechan, R. Compton, J. Nogués, Ivan K. Schuller

Chemical Engineering and Materials Science

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Abstract

Single-crystal thin films of the antiferromagnet FeF ₂ have been used to exchange bias overlayers of Fe. An unexpected coercivity enhancement is observed at temperatures above the Néel temperature of the FeF ₂. This coercivity reaches a peak value of over 600 Oe close to the Néel temperature and persists to above 300 K. The coercivity is correlated with the growth of an anisotropy in the ferromagnet, the increase of the antiferromagnetic susceptibility and the increase of the ferromagnetic resonance linewidth. We argue that the growth of spin fluctuations in the antiferromagnet leads to an enhanced ferromagnetic anisotropy, and therefore coercivity, above the Néel temperature.

Original language	English (US)
Pages (from-to)	1483-1488
Number of pages	6
Journal	Journal of Applied Physics
Volume	92
Issue number	3
DOIs	https://doi.org/10.1063/1.1491277
State	Published - Aug 1 2002

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abstract = "Single-crystal thin films of the antiferromagnet FeF 2 have been used to exchange bias overlayers of Fe. An unexpected coercivity enhancement is observed at temperatures above the N{\'e}el temperature of the FeF 2. This coercivity reaches a peak value of over 600 Oe close to the N{\'e}el temperature and persists to above 300 K. The coercivity is correlated with the growth of an anisotropy in the ferromagnet, the increase of the antiferromagnetic susceptibility and the increase of the ferromagnetic resonance linewidth. We argue that the growth of spin fluctuations in the antiferromagnet leads to an enhanced ferromagnetic anisotropy, and therefore coercivity, above the N{\'e}el temperature.",

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AU - Leighton, C.

AU - Suhl, H.

AU - Pechan, Michael J.

AU - Compton, R.

AU - Nogués, J.

AU - Schuller, Ivan K.

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N2 - Single-crystal thin films of the antiferromagnet FeF 2 have been used to exchange bias overlayers of Fe. An unexpected coercivity enhancement is observed at temperatures above the Néel temperature of the FeF 2. This coercivity reaches a peak value of over 600 Oe close to the Néel temperature and persists to above 300 K. The coercivity is correlated with the growth of an anisotropy in the ferromagnet, the increase of the antiferromagnetic susceptibility and the increase of the ferromagnetic resonance linewidth. We argue that the growth of spin fluctuations in the antiferromagnet leads to an enhanced ferromagnetic anisotropy, and therefore coercivity, above the Néel temperature.

AB - Single-crystal thin films of the antiferromagnet FeF 2 have been used to exchange bias overlayers of Fe. An unexpected coercivity enhancement is observed at temperatures above the Néel temperature of the FeF 2. This coercivity reaches a peak value of over 600 Oe close to the Néel temperature and persists to above 300 K. The coercivity is correlated with the growth of an anisotropy in the ferromagnet, the increase of the antiferromagnetic susceptibility and the increase of the ferromagnetic resonance linewidth. We argue that the growth of spin fluctuations in the antiferromagnet leads to an enhanced ferromagnetic anisotropy, and therefore coercivity, above the Néel temperature.

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Coercivity enhancement above the Néel temperature of an antiferromagnet/ferromagnet bilayer

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