The antiferromagnetic structures of IrMn3 and their influence on exchange-bias.
The antiferromagnetic structures of IrMn3 and their influence on exchange-bias.
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DOI：
10.1038/srep02412
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发表时间：
2013
影响因子：
4.6
通讯作者：
Goff, J. P.
中科院分区：
文献类型：
--
作者：
Kohn, A.;Kovacs, A.;Fan, R.;McIntyre, G. J.;Ward, R. C. C.;Goff, J. P.
我们已经确定了IrMn 3的单晶薄膜的磁性结构的化学有序的L12的晶相，和化学无序的面心立方，这是相通常选择用于信息存储设备。对于化学有序的L12薄膜，我们发现相同的三角形磁性结构报告的散装材料。我们确定的磁性结构的化学无序的面心立方合金的第一次，这不同于理论预测，与磁矩倾斜远离晶体对角线朝向面平面。我们研究了这两种反铁磁结构对外延体心立方Fe层交换偏置特性的影响，结果表明铁磁层中的磁化反转机制和偏置场发生了显著的改变。我们报告了反转机制的变化，从面内成核的90°畴壁时，耦合到新报道的立方结构向旋转过程，包括面外磁化分量时，耦合到L12三角形结构。
We have determined the magnetic structures of single-crystal thin-films of IrMn3 for the crystallographic phases of chemically-ordered L12, and for chemically-disordered face-centred-cubic, which is the phase typically chosen for information-storage devices. For the chemically-ordered L12 thin-film, we find the same triangular magnetic structure as reported for the bulk material. We determine the magnetic structure of the chemically-disordered face-centred-cubic alloy for the first time, which differs from theoretical predictions, with magnetic moments tilted away from the crystal diagonals towards the face-planes. We study the influence of these two antiferromagnetic structures on the exchange-bias properties of an epitaxial body-centred-cubic Fe layer showing that magnetization reversal mechanism and bias-field in the ferromagnetic layer is altered significantly. We report a change of reversal mechanism from in-plane nucleation of 90° domain-walls when coupled to the newly reported cubic structure towards a rotational process, including an out-of-plane magnetization component when coupled to the L12 triangular structure.
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影响因子：
3.2
作者：
Imakita, K;Tsunoda, M;Takahashi, M
通讯作者：
Takahashi, M
影响因子：
2.7
作者：
Tsunoda, M;Imakita, K;Takahashi, M
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Takahashi, M
影响因子：
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作者：
Fishman, RS;Lee, WT;Thompson, JR
通讯作者：
Thompson, JR
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作者：
UMEBAYASHI, H;ISHIKAWA, Y
通讯作者：
ISHIKAWA, Y
影响因子：
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作者：
Wang, S. G.;Kohn, A.;Ward, R. C. C.
通讯作者：
Ward, R. C. C.