[20a-C102-1~12] 6.3 Oxide electronics

△ [20a-C102-9] Origins of spin depolarization in half-metal CrO₂: High-resolution spin-resolved photoemission spectroscopy study

〇Hirokazu Fujiwara¹, Kensei Terashima², Masanori Sunagawa¹, Yuko Yano¹, Fumiya Yoshii¹, Yuka Matsuura¹, Koichiro Yaji³, Ayumi Harasawa³, Kenta Kuroda³, Shik Shin³, Takanori Wakita², Yuji Muraoka^1,2, Takayoshi Yokoya^1,2 (1.Okayama Univ., 2.RIIS Okayama Univ., 3.ISSP)

Keywords:half-metallic ferromagnet, spin-resolved photoemission spectroscopy, spintronics

Half-metal CrO₂ shows more than 90% spin polarization at low temperatures. However, the spin polarization drops rapidly with increasing temperatures, which cannot be understood from the macroscopic magnetic behavior of CrO₂. In order to reveal origins of the rapid spin depolarization, we performed high-resolution spin-resolved photoemission spectroscopy measurements on CrO₂. We directly observed a fine spin depolarization near the Fermi level above 80 K for the first time. In our talk, we will also discuss origins of the spin depolarization and methods to obtain higher spin polarization at room temperature.