Evidence for spin swapping in an antiferromagnet
Evidence for spin swapping in an antiferromagnet
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DOI：
10.1038/s41567-022-01608-w
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发表时间：
2022-05-16
期刊：
影响因子：
19.6
通讯作者：
Chien, C. L.
中科院分区：
文献类型：
--
作者：
Lin, Weiwei;He, Jiaming;Chien, C. L.
反铁磁绝缘体由于其杂散场可忽略不计和超快磁动力学，在自旋电子学应用中具有战略优势。控制它们的磁化强度和读出它们的磁状态对于这些应用至关重要，但仍然具有挑战性。在这里，我们报告了倾斜反铁磁绝缘体 LaFeO3 中室温磁化强度翻转的电检测，该绝缘体覆盖有 Pt 或 W 覆盖层。对具有面内温度梯度的大磁热电压的观察表明，该机制是反铁磁体中自旋电流的交换。这种效应为绝缘体中微小的净磁化强度提供了灵敏的电探针，可以通过 10 mT 量级的磁场来操纵。我们的研究结果突出了用于自旋电子学和自旋热电子学的绝缘倾斜反铁磁体的新材料类别，并提出了一种在反铁磁绝缘体中电读出磁信号的方法。反铁磁体状态的电读出是自旋电子学应用的一个重要目标。现在，对倾斜反铁磁体中的热梯度产生的电压的检测提出了实现这一目标的途径。
Antiferromagnetic insulators offer strategic advantages in spintronic applications because of their negligible stray fields and ultrafast magnetic dynamics. Control of their magnetization and readout of their magnetic state are essential for these applications but remain challenging. Here we report the electrical detection of room-temperature magnetization switching in the canted antiferromagnetic insulator LaFeO3, capped with a Pt or W overlayer. The observation of a large magneto-thermovoltage with an in-plane temperature gradient suggests that the mechanism is the swapping of spin currents in the antiferromagnet. This effect provides a sensitive electrical probe of the tiny net magnetization in the insulator, which can be manipulated by a magnetic field on the order of 10 mT. Our results highlight a new material class of insulating canted antiferromagnets for spintronics and spin caloritronics and suggests a method for the electrical readout of magnetic signals in an antiferromagnetic insulator.Electrical readout of the state of an antiferromagnet is an important goal for spintronic applications. Now, detection of the electrical voltage created by a thermal gradient in a canted antiferromagnet suggests a route for achieving this goal.