Temperature dependence of dipole-induced exchange bias
Temperature dependence of dipole-induced exchange bias
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偶极子引起的交换偏压的温度依赖性
DOI：
10.1088/1361-6528/ab87c9
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发表时间：
2020-04
期刊：
影响因子：
3.5
通讯作者：
Hu Yong
中科院分区：
文献类型：
--
作者：
Lu Qiang;Hu Yong
采用改进的蒙特卡罗方法研究了由铁磁体/反铁磁体界面偶极相互作用引起的交换偏置在场冷却后对温度的依赖性。由于在反铁磁层中保留了足够的非零剩余磁化，产生了一个正交换偏置场。值得注意的是，这个交换场随着温度的降低而增加，并可能在低温时趋于平稳。然后，调制反铁磁各向异性常数、相对于冷却场方向的易轴方向、反铁磁交换常数和反铁磁层厚度，研究它们在建立低温高原样交换偏置场中的作用。足够厚且易轴向与冷却场对齐的反铁磁层使平台高度最大化，反铁磁各向异性常数大，而反铁磁交换常数小则使平台高度从交换偏置阻塞温度到最低温度都大大拓宽。通过显式计算反铁磁层的剩余磁化值以及反铁磁层的偶极能和塞曼能，发现铁磁体/反铁磁界面的偶极相互作用在环的下降分支占主导地位，随着温度的降低抑制了顽固性场；相反，磁场在上升支路起主导作用，与下降支路的矫顽力场减小的速度相同，磁场单调增强矫顽力场。因此，环路保持恒定的位移，并随着温度的降低而变宽。对温度不敏感的远距离非接触交换偏置可用于研制具有单向各向异性的抗热搅拌自旋电子器件。
A modified Monte Carlo method is used to study the dependence of exchange bias, induced by long-range ferromagnet/antiferromagnet interfacial dipolar interactions, on temperature after field cooling. Since sufficient nonzero surplus magnetization in the antiferromagnetic layer is preserved, a positive exchange bias field is yielded. Significantly, this exchange field increases with decreasing temperature and may level off at low temperatures. Then, the antiferromagnetic anisotropy constant, easy-axis direction with respect to the cooling-field direction, antiferromagnetic exchange constant, and antiferromagnetic layer thickness were modulated to study their roles in establishing the low-temperature plateau-like exchange bias field. A thick enough antiferromagnetic layer with the easy-axis direction aligning with the cooling field maximizes the plateau height with a large antiferromagnetic anisotropy constant, while a small antiferromagnetic exchange constant greatly widens the plateau, even from the exchange bias blocking temperature to the lowest temperature. On explicitly calculating the surplus magnetization values in the antiferromagnetic layer meanwhile the dipolar and Zeeman energies in the antiferromagnetic layer, it is found that the ferromagnet/antiferromagnet interfacial dipolar interactions are predominant at the descending branch of the loop to suppress the coercive field with decreasing temperature; in contrast, the magnetic field takes over the lead at the ascending branch and monotonically enhances the coercive field, at the same pace as the decrease in the coercive field at the descending branch. As a consequence, the loop retains a constant shift and becomes wider with decreasing temperature. The long-range noncontact exchange bias that is insensitive to temperature may be used to develop thermal-agitation-resistant spintronic devices with unidirectional anisotropy.
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影响因子：
19
作者：
Mathias Dolci;Yu Liu;Xiaojie Liu;C. Leuvrey;A. Derory;D. Bégin;S. Bégin-Colin;B. Pichon
通讯作者：
Mathias Dolci;Yu Liu;Xiaojie Liu;C. Leuvrey;A. Derory;D. Bégin;S. Bégin-Colin;B. Pichon
影响因子：
2.7
作者：
D. Ledue;A. Maître;F. Barbe;L. Lechevallier
通讯作者：
D. Ledue;A. Maître;F. Barbe;L. Lechevallier
影响因子：
2.1
作者：
M. Doerner;K. Tang;T. Arnoldussen;Haoqun Zeng;M. Toney;D. Weller
通讯作者：
M. Doerner;K. Tang;T. Arnoldussen;Haoqun Zeng;M. Toney;D. Weller
DOI：
10.1088/1361-6463/aab023
发表时间：
2018-03
期刊：
Journal of Physics D: Applied Physics
影响因子：
--
作者：
J. Richy;T. Hauguel;J. Jay;S. Pogossian;B. Warot-Fonrose;C. Sheppard;J. Snyman;A. Strydom
通讯作者：
J. Richy;T. Hauguel;J. Jay;S. Pogossian;B. Warot-Fonrose;C. Sheppard;J. Snyman;A. Strydom
影响因子：
3.7
作者：
M. Stiles;R. McMichael
通讯作者：
M. Stiles;R. McMichael