Controlling the exchange interaction using the spin-flip transition of antiferromagnetic spins in Ni 81 Fe 19 α- Fe 2 O 3

Joonghoe Dho; C. W. Leung; Z. H. Barber; M. G. Blamire

doi:10.1063/1.1846191

Controlling the exchange interaction using the spin-flip transition of antiferromagnetic spins in Ni ₈₁ Fe ₁₉ α- Fe ₂ O ₃

Joonghoe Dho, C. W. Leung, Z. H. Barber, M. G. Blamire

Department of Physics

University of Cambridge

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

6 Scopus citations

Abstract

We have studied exchange bias and coercivity in ferromagnetic (FM) Ni81 Fe19 layers coupled with antiferromagnetic (AF) (0001), (11 2- 0), and (1 1- 02) α- Fe2 O3 layers. We show that the exchange interaction between FM and AF layers is controllable by a magnetic-field annealing (MFA) through a spin reorientation temperature of an AF material, similar to a MFA through a Ǹel temperature in normal exchange-biased systems. For (11 2- 0) and (1 1- 02) α- Fe2 O3, the temperature-dependent exchange bias displayed a sudden increase below a spin-flip temperature of α- Fe2 O3 (Tm) and the coercivity showed a clear variation near Tm.

Original language	English
Article number	10K101
Journal	Journal of Applied Physics
Volume	97
Issue number	10
DOIs	https://doi.org/10.1063/1.1846191
State	Published - 15 May 2005

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abstract = "We have studied exchange bias and coercivity in ferromagnetic (FM) Ni81 Fe19 layers coupled with antiferromagnetic (AF) (0001), (11 2- 0), and (1 1- 02) α- Fe2 O3 layers. We show that the exchange interaction between FM and AF layers is controllable by a magnetic-field annealing (MFA) through a spin reorientation temperature of an AF material, similar to a MFA through a Ǹel temperature in normal exchange-biased systems. For (11 2- 0) and (1 1- 02) α- Fe2 O3, the temperature-dependent exchange bias displayed a sudden increase below a spin-flip temperature of α- Fe2 O3 (Tm) and the coercivity showed a clear variation near Tm.",

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T1 - Controlling the exchange interaction using the spin-flip transition of antiferromagnetic spins in Ni 81 Fe 19 α- Fe 2 O 3

AU - Dho, Joonghoe

AU - Leung, C. W.

AU - Barber, Z. H.

AU - Blamire, M. G.

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N2 - We have studied exchange bias and coercivity in ferromagnetic (FM) Ni81 Fe19 layers coupled with antiferromagnetic (AF) (0001), (11 2- 0), and (1 1- 02) α- Fe2 O3 layers. We show that the exchange interaction between FM and AF layers is controllable by a magnetic-field annealing (MFA) through a spin reorientation temperature of an AF material, similar to a MFA through a Ǹel temperature in normal exchange-biased systems. For (11 2- 0) and (1 1- 02) α- Fe2 O3, the temperature-dependent exchange bias displayed a sudden increase below a spin-flip temperature of α- Fe2 O3 (Tm) and the coercivity showed a clear variation near Tm.

AB - We have studied exchange bias and coercivity in ferromagnetic (FM) Ni81 Fe19 layers coupled with antiferromagnetic (AF) (0001), (11 2- 0), and (1 1- 02) α- Fe2 O3 layers. We show that the exchange interaction between FM and AF layers is controllable by a magnetic-field annealing (MFA) through a spin reorientation temperature of an AF material, similar to a MFA through a Ǹel temperature in normal exchange-biased systems. For (11 2- 0) and (1 1- 02) α- Fe2 O3, the temperature-dependent exchange bias displayed a sudden increase below a spin-flip temperature of α- Fe2 O3 (Tm) and the coercivity showed a clear variation near Tm.

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Controlling the exchange interaction using the spin-flip transition of antiferromagnetic spins in Ni ₈₁ Fe ₁₉ α- Fe ₂ O ₃

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