Scaling the electrical current switching of exchange bias in fully epitaxial antiferromagnet/ferromagnet bilayers
Scaling the electrical current switching of exchange bias in fully epitaxial antiferromagnet/ferromagnet bilayers
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DOI：
10.1103/physrevb.102.014404
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发表时间：
2020-06
影响因子：
3.7
通讯作者：
T. Hajiri;H. Goto;H. Asano
中科院分区：
文献类型：
--
作者：
T. Hajiri;H. Goto;H. Asano
虽然反铁磁体 (AFM) 的电流操纵已经得到证实，但由于系统实验很少且了解不足，AFM 材料的研究范围受到限制。我们比较了 AFM-${\mathrm{Mn}}_{3}A\mathrm{N}$/ferromagnet-${\mathrm{Co}}_{3}\mathrm{FeN}$ 双层中交换偏置场 (${H}_{\text{ex}}$) 的电流切换。施加的脉冲电流可以相对于电流密度和 FM 层磁化强度来操纵 ${H}_{\text{ex}}$，FM 层磁化强度作为电流密度的函数呈指数变化。我们发现饱和电流密度和指数衰减常数$\ensuremath{\tau}$随着AFM Mn原子的局域矩而增加。我们的结果强调了 AFM 局部矩对 ${H}_{\text{ex}}$ 电流切换的影响，尽管它的净磁化强度接近于零，并且可能为探索 AFM 材料的电流操纵提供一种简便的方法。
While the electrical current manipulation of antiferromagnets (AFMs) has been demonstrated, the extent of the studied AFM materials has been limited with few systematic experiments and a poor understanding. We compare the electrical current switching of the exchange-bias field (${H}_{\text{ex}}$) in AFM-${\mathrm{Mn}}_{3}A\mathrm{N}$/ferromagnet-${\mathrm{Co}}_{3}\mathrm{FeN}$ bilayers. An applied pulse current can manipulate ${H}_{\text{ex}}$ with respect to the current density and FM layer magnetization, which shifts exponentially as a function of the current density. We found that the saturation current density and exponential decay constant $\ensuremath{\tau}$ increase with the local moment of AFM Mn atoms. Our results highlight the effect of the AFM local moment to electrical current switching of ${H}_{\text{ex}}$, although it has a near-zero net magnetization, and may provide a facile way to explore the electrical current manipulation of AFM materials.