Controlling the exchange interaction using the spin-flip transition of antiferromagnetic spins in Ni81Fe19/α-Fe2O3 -: art. no. 10K101

被引：6
|
作者：
Dho, J [1 ]
Leung, CW [1 ]
Barber, ZH [1 ]
Blamire, MG [1 ]
机构：
[1] Univ Cambridge, Dept Mat Sci & Met, Cambridge CB2 3QZ, England
来源：
JOURNAL OF APPLIED PHYSICS | 2005年 / 97卷 / 10期
关键词：
D O I：
10.1063/1.1846191
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have studied exchange bias and coercivity in ferromagnetic (FM) Ni81Fe19 layers coupled with antiferromagnetic (AF) (0001), (11 (2) over bar0), and (1 (1) over bar 02) alpha-Fe2O3 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 Neel temperature in normal exchange-biased systems. For (11 (2) over bar0) and (1 (1) over bar 02) alpha-Fe2O3, the temperature-dependent exchange bias displayed a sudden increase below a spin-flip temperature of alpha-Fe2O3 (T-m) and the coercivity showed a clear variation near T-m. (c) 2005 American Institute of Physics.
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