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

Joonghoe Dho; Chi Wah 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, Chi Wah Leung, Z. H. Barber, M. G. Blamire

Research output: Journal article publication › Journal article › Academic research › peer-review

5 Citations (Scopus)

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
Publication status	Published - 15 May 2005
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)
Physics and Astronomy(all)

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

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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AU - Dho, Joonghoe

AU - Leung, Chi Wah

AU - Barber, Z. H.

AU - Blamire, M. G.

PY - 2005/5/15

Y1 - 2005/5/15

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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DO - 10.1063/1.1846191

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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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