[14p-C41-1~21] 10.4 半導体・有機・光・量子スピントロニクス

▼ [14p-C41-3] Origin of the large magnetoresistance in Ge_1-xMn_x granular thin films

〇Yuuki Wakabayashi¹、Ryota Akiyama²、Yukiharu Takeda³、Masafumi Horio²、Goro Shibata²、Shoya Sakamoto²、Yoshisuke Ban¹、Yuji Saitoh³、Hiroshi Yamagami⁴、Atsushi Fujimori²、Masaaki Tanaka¹、Shinobu Ohya¹ (1.Eng. Univ. of Tokyo、2.Phys. Univ. of Tokyo、3.JAEA、4.Kyoto Sangyo Univ.)

キーワード：spintronics, granular, XMCD

Ge_1–xMn_x granular films are a promising material for spintronics applications due to the large positive magnetoresistance (MR) up to 280%. Previous studies suggested that this MR is related to nanospinodal decomposition into ferromagnetic metallic Mn-rich nanoparticles and a paramagnetic Mn-poor matrix; however, its microscopic origin of the MR has not been clarified yet. In this study, we clarify the origin of the MR by using a new method to investigate the magnetic properties of the nanoparticles and the matrix separately using X-ray magnetic circular dichroism.