Control of the Interfacial Exchange Coupling Energy in Pt/Co/ $\alpha$ -Cr $_{2}$ O $_{3}$ Films by Inserting a Pt Spacer Layer at the Co/ $\alpha$ -Cr $_{2}$ O $_{3}$ Interface
Control of the Interfacial Exchange Coupling Energy in Pt/Co/ $\alpha$ -Cr $_{2}$ O $_{3}$ Films by Inserting a Pt Spacer Layer at the Co/ $\alpha$ -Cr $_{2}$ O $_{3}$ Interface
复制标题
DOI：
10.1109/tmag.2011.2158073
复制
发表时间：
2011-09
影响因子：
2.1
通讯作者：
Y. Shiratsuchi;T. Fujita;H. Noutomi;H. Oikawa;R. Nakatani
中科院分区：
文献类型：
--
作者：
Y. Shiratsuchi;T. Fujita;H. Noutomi;H. Oikawa;R. Nakatani
研究了Pt/Co/α-Cr_2O_3（0001）薄膜中垂直交换偏置（PEB）的控制。在此之前，我们证明了PEB的发生是由界面耦合能和α-Cr2 O3层中的磁各向异性能之间的竞争来解释的。基于这一发现，在这项研究中，我们研究了在Co/α-Cr2 O3界面的Pt间隔层的影响，以控制界面交换耦合。通过插入Pt间隔层，由于Co与α-Cr2 O3之间的交换耦合减弱，单向磁各向异性能JK降低。减弱的直接交换耦合引起JK的起始温度的增加，导致保持PEB高达Neel温度所需的α-Cr2 O3层厚度的减少。此外，还讨论了Co与α-Cr_2O_3界面交换耦合机制随温度变化的规律。
We investigated the control of the perpendicular exchange bias (PEB) in Pt/Co/α-Cr2O3 (0001) thin films that exhibit a unique temperature dependence of the PEB. Previously, we demonstrated that the onset of the PEB is explained by the competition between the interface coupling energy and the magnetic anisotropy energy in the α-Cr2O3 layer. Based on this finding, in this study, we investigated the influence of a Pt spacer layer at the Co/α-Cr2O3 interface to control the interface exchange coupling. By inserting a Pt spacer layer, the unidirectional magnetic anisotropy energy JK was reduced because of the weakened exchange coupling between Co and α-Cr2O3. The weakened direct exchange coupling caused an increase in the onset temperature of JK, resulting in a reduction in the α-Cr2O3 layer thickness necessary to maintain the PEB up to the Neel temperature. In addition, the change in the interface exchange coupling mechanism between Co and α-Cr2O3 is discussed with respect to the temperature dependence of JK.