论文标题
域切换的磁磁性显微镜在共线抗fiferromagnet cumnas中
Magneto-Seebeck microscopy of domain switching in collinear antiferromagnet CuMnAs
论文作者
论文摘要
抗铁磁铁由于缺乏流浪场，THZ旋转动力学和丰富的材料景观而在铁磁体中无与伦比提供了自旋装置特性。对磁磁性域的微观成像是使设备操作的物理原理了解的关键先决条件之一。但是，将常见的磁力测定技术适应无偶极场的无抗铁磁铁一直是一个重大挑战。在这里，我们通过将磁性观测效应与扫描远场或近场技术产生的局部热梯度相结合，在共线抗铁磁铁中证明了热电检测方法。在单轴cumnas的20 nm表层中，我们观察到可逆的néel载体通过域壁位移的180度切换，并由电流脉冲的极性控制。我们还图像较厚的双轴膜中Néel载体的极性依赖性90度转换，并在较高的脉冲幅度下诱导的域破碎。使用X射线磁性线性二色症将通过我们的实验室技术获得的抗铁磁结构域图与已建立的同步加速器显微镜进行了比较。
Antiferromagnets offer spintronic device characteristics unparalleled in ferromagnets owing to their lack of stray fields, THz spin dynamics, and rich materials landscape. Microscopic imaging of aniferromagnetic domains is one of the key prerequisites for understading physical principles of the device operation. However, adapting common magnetometry techniques to the dipolar-field-free antiferromagnets has been a major challenge. Here we demonstrate in a collinear antiferromagnet a thermoelectric detection method by combining the magneto-Seebeck effect with local heat gradients generated by scanning far-field or near-field techniques. In a 20 nm epilayer of uniaxial CuMnAs we observe reversible 180 deg switching of the Néel vector via domain wall displacement, controlled by the polarity of the current pulses. We also image polarity-dependent 90 deg switching of the Néel vector in a thicker biaxial film, and domain shattering induced at higher pulse amplitudes. The antiferromagnetic domain maps obtained by our laboratory technique are compared to measurements by the established synchrotron microscopy using X-ray magnetic linear dichroism.
