[14p-C41-1~21] 10.4 Semiconductors, organic, optical, and quantum spintronics

▼ [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.)

Keywords: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.