Exchange bias and coercivity for ferromagnets coupled to the domain state and spin glass state
Exchange bias and coercivity for ferromagnets coupled to the domain state and spin glass state
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与磁畴态和自旋玻璃态耦合的铁磁体的交换偏压和矫顽力
DOI：
10.1088/0022-3727/49/18/185002
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发表时间：
2016-04
影响因子：
3.4
通讯作者：
Chen, Xi
中科院分区：
文献类型：
--
作者：
Zhan, Xiaozhi;Mao, Zhongquan;Chen, Xi
用蒙特卡罗模拟方法研究了具有铁磁层（FM）与键稀释钉钉层耦合的系统的交换偏置（EB）效应。选择两种键稀释浓度得到两种钉钉层：反铁磁畴态（DS）和自旋玻璃态（SG）。结果表明，当耦合到无序的SG态时，由于在钉钉界面处存在大量的冻结自旋和可逆自旋，铁磁体表现出更高矫顽力的增强EB。FM/DS界面层的自旋构型表明，可逆自旋主要存在于畴边界和小畴中，而大畴中的大多数自旋保持反铁磁耦合，并有助于EB效应。矫顽力与界面可逆自旋的数量成线性关系，但在阻断温度tB以上或以下的温度范围内，矫顽力的斜率不同。这种温度相关的双峰矫顽力表明，在温度为tB时，宏观界面耦合发生了突然变化。
The exchange bias (EB) effect for systems with a ferromagnetic (FM) layer coupled to bond-diluted pinning layers has been investigated by Monte Carlo simulations. Two bond dilution concentrations are chosen to obtain two kinds of pinning layers: the antiferromagnetic domain state (DS) and the spin glass (SG) state. It is found that when coupled to the more disordered SG state, the ferromagnet shows enhanced EB with higher coercivity due to larger amounts of both frozen and reversible spins at the pinning interface. Spin configurations of the FM/DS interface layer reveal that reversible spins are mostly found in domain boundaries and small domains, while most spins in large domains maintain antiferromagnetic coupling and contribute to the EB effect. The coercivity is linear to the amount of interface reversible spins, but with different slopes in the temperature ranges above or below the blocking temperature tB. This bimodal temperature-dependent coercivity indicates a sudden change in macroscopic interface coupling at the temperature tB.
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影响因子：
3.7
作者：
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通讯作者：
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