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Probing exchange bias at the surface of a doped ferrimagnetic insulator
Physical Review Materials ( IF 3.1 ) Pub Date : 2021-07-26 , DOI: 10.1103/physrevmaterials.5.074409 Yang Wang 1 , Xiao Wang 2 , Andy T. Clark 2 , Hang Chen 1 , Xuemei M. Cheng 2 , John W. Freeland 3 , John Q. Xiao 1
Physical Review Materials ( IF 3.1 ) Pub Date : 2021-07-26 , DOI: 10.1103/physrevmaterials.5.074409 Yang Wang 1 , Xiao Wang 2 , Andy T. Clark 2 , Hang Chen 1 , Xuemei M. Cheng 2 , John W. Freeland 3 , John Q. Xiao 1
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With the realization of stress-induced perpendicular magnetic anisotropy, efficient spin-orbit torque switching, and room temperature topological Hall effect, interest in rare earth iron garnets has been revived in recent years for their potential in spintronic applications. In this study, we investigate the magnetic properties of micrometer-thick Bi and Ga substituted thulium iron garnets (BiGa:TmIG) grown by the liquid-phase epitaxy method. Above the magnetization compensation (MC) temperature, anomalous triple hysteresis is observed in BiGa:TmIG/Pt heterostructures by anomalous Hall effect measurements. X-ray magnetic circular dichroism and energy dispersive spectroscopy measurements reveal its origin as an internal exchange bias (EB) effect arising from inhomogeneities localized at the surface of the film. Possibly depending on the difference in thickness and defect realization of the EB layer, two types of magnetization reversal mechanisms, namely, the Stoner-Wohlfarth type and the reversible domain-wall motion type, are observed. Our results show that rich meta-magnetic phases exist in garnets close to MC, which can be robustly tuned by chemical composition engineering and conveniently probed by electrical transport measurements.
中文翻译：
探测掺杂亚铁磁绝缘体表面的交换偏置
随着应力诱导的垂直磁各向异性、高效的自旋轨道扭矩切换和室温拓扑霍尔效应的实现，稀土铁石榴石因其在自旋电子应用中的潜力近年来重新引起了人们的兴趣。在这项研究中，我们研究了通过液相外延法生长的微米厚的 Bi 和 Ga 取代铥铁石榴石 (BiGa:TmIG) 的磁性。在磁化补偿 (MC) 温度以上，通过异常霍尔效应测量在 BiGa:TmIG/Pt 异质结构中观察到异常三重滞后。X 射线磁性圆二色性和能量色散光谱测量表明其起源是由于薄膜表面局部不均匀性引起的内部交换偏置 (EB) 效应。可能取决于 EB 层的厚度和缺陷实现的差异，观察到两种类型的磁化反转机制，即 Stoner-Wohlfarth 型和可逆畴壁运动型。我们的结果表明，在靠近 MC 的石榴石中存在丰富的变磁相，可以通过化学成分工程对其进行稳健调整，并可以方便地通过电输运测量进行探测。
更新日期：2021-07-26
中文翻译：
探测掺杂亚铁磁绝缘体表面的交换偏置
随着应力诱导的垂直磁各向异性、高效的自旋轨道扭矩切换和室温拓扑霍尔效应的实现，稀土铁石榴石因其在自旋电子应用中的潜力近年来重新引起了人们的兴趣。在这项研究中，我们研究了通过液相外延法生长的微米厚的 Bi 和 Ga 取代铥铁石榴石 (BiGa:TmIG) 的磁性。在磁化补偿 (MC) 温度以上，通过异常霍尔效应测量在 BiGa:TmIG/Pt 异质结构中观察到异常三重滞后。X 射线磁性圆二色性和能量色散光谱测量表明其起源是由于薄膜表面局部不均匀性引起的内部交换偏置 (EB) 效应。可能取决于 EB 层的厚度和缺陷实现的差异，观察到两种类型的磁化反转机制，即 Stoner-Wohlfarth 型和可逆畴壁运动型。我们的结果表明，在靠近 MC 的石榴石中存在丰富的变磁相，可以通过化学成分工程对其进行稳健调整，并可以方便地通过电输运测量进行探测。
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