[14p-P10-1~98] 10 Spintronics and Magnetics（Poster）

▼ [14p-P10-42] Junction size dependence of damping constans in nanoscale CoFEB/MgO magnetic tunnel junctions

〇Motoya Shinozaki¹, Eriko Hirayama¹, Shun Kanai^1,2,3, Hideo Sato^2,3,4, Fumihiro Matsukura^1,2,3,5, Hideo Ohno^1,2,3,4,5 (1.RIEC, Tohoku Univ., 2.CSIS, Tohoku Univ., 3.CSRN, Tohoku Univ., 4.CIES, Tohoku Univ., 5.WPI-AIMR, Tohoku Univ.)

Keywords:magnetic tunnel junction, damping constant

In the previous studies on p-MTJs, the FMR was measured under in-plane magnetic fields. The tilt of magnetization of the free layer resulted in extrinsic contributions to spectral linewidths. In this study, we measure FMR of nanoscale MTJs with a free layer with perpendicular easy axis and a reference layer with in-plane easy direction under a perpendicular magnetic field in order to suppress the extrinsic contributions and evaluate a damping constant in the free layer.