界面ジャロシンスキー?守谷相互作用と旋回性磁区構造の発現機構—スピンホールトルク駆動磁壁移動素子ヘの展開-

摘要

Strong spin orbit effects in magnetic heterostructures consisting of a perpendicularly magnetized ultrathin magnetic layer sandwiched between a heavy metal (HM) layer and an insulating oxide layer have been attracting a great deal of interest as they have opened up new paradigms to electrically control magnetic moments. The spin Hall effect of the heavy metal layer and the Dzyalonshinskii-Moriya interaction (DMI) at the heavy metal layer/ferromagnetic layer interface play a dominant role in defining motion of magnetic domain walls in magnetic nanowires. Here, we discuss how DMI at interfaces generates chiral magnetic domain walls that can be driven by the spin Hall torque. Experimental results on the dependence of DMI on the film stack are discussed to provide clues to the origin of DMI at interfaces.