[22a-W241-1~11] CS.6 10.1/10.2/10.3 Code sharing session "Emerging control-methods of magnetization and related phenomena"

▼ [22a-W241-7] Voltage modulation of interfacial spin direction at MnIr|MgO
with triple-Q spin state

〇Minori Goto¹, Kohei Nawaoka¹, Shinji Miwa¹, Shohei Hatanaka¹, Norikazu Mizuochi², Yoshishige Suzuki¹ (1.Osaka Univ., 2.Kyoto Univ.)

Keywords:electric field effect,antiferromagnet,TAMR

Antiferromagnetic materials attracts a great attention in spintronics for developing high speed and high density spin devices. To realize such spin devices, electrical control of antiferromagnetic spin is essential. Recently, electrical control of antiferromagnetic spin was reported in MnIr [1]. The result seems to suggest that the electric field modifies interfacial spins at MnIr|MgO. To understand the interfacial spin in detail, in this study, we investigated the interfacial spin driven by electric field measured by tunneling anisotropic magnetoresistance (TAMR [2]) effect which can detect interfacial spin direction.
We employed the NiFe|MnIr|MgO|Ta tunnel junction fabricated by magnetron sputtering, photo-lithography, and Ar ion milling as shown in Fig. 1. The TAMR curve in MnIr|MgO|Ta tunnel junction was measured under dc voltage. In order to extract the modulation of interfacial spin direction, we normalized the TAMR curve by its TAMR ratio as shown in Fig. 2. We have found that the line width of peak at B_z = 0 depends on the dc voltage. The results can be explained by voltage modulation of magnetic anisotropy in triple Q type spin structure [3] of g-MnIr.
This work was supported by ImPACT Program of Council for Science, Technology and Innovation.