磁性薄膜的有效垂直磁各向异性场的全输运测量

Entire transport measurement of effective perpendicular magnetic anisotropy field of magnetic thin film

采用磁控溅射方法,通过金属掩膜板制备了霍尔棒形状"CoFeB/MgO"体系薄膜样品,其中CoFeB层厚度为1.0nm、1.1nm、1.2nm,利用垂直温度梯度的反常能斯特效应和反常霍尔效应对其相关磁输运特性进行了测量,所得结果可分别等效为常规面内和垂直方向的磁滞回线,并由此获得了薄膜的有效垂直各向异性场.

Using magnetron sputtering method and a hall-bar shaped metal mask plate, CoFeB/ MgO thin film samples were prepared, with CoFeB layer thickness of 1.0 nm, 1.1 nm, and 1.2 nm, respectively. The magnetic transport properties were measured by anomalous Nernst effect in vertical temperature gradient and anomalous Hall effect. The results were equivalent to the hysteresis loops in the conventional plane direction and the perpendicular direction, and thus the effective perpendicular anisotropy field was obtained, which was consonant with the data reported by references.