[16p-D704-1~18] 10.4 半導体・トポロジカル・超伝導・強相関スピントロニクス

▼ [16p-D704-9] Change of the band structure in a freestanding La_0.67Sr_0.33MnO₃ thin film

〇(M1)Takuma Arai¹、Shingo Kaneta-Takada¹、Le Duc Anh^1,2,3、Masaki Kobayashi^1,3、Masaaki Tanaka^1,3、Shinobu Ohya^1,3 (1.Univ. of Tokyo、2.PRESTO、3.CSRN, Univ. of Tokyo)

キーワード：freestanding, strongly correlated system, SAO

Freestanding La_1-xSr_xMnO₃ (LSMO) thin films have attracted much attention for spintronics applications due to their bulk half-metallic nature. However, no systematic data of the magnetic properties of these films have been available until now. In this presentation, we evaluate the quality of an epitaxially grown freestanding LSMO thin film and show the change of the band structure by comparing its magnetic circular dichroism (MCD) spectrum with strained LSMO thin films epitaxially grown on two typically used substrates. The X-ray diffraction (XRD) scans and the MCD spectrum indicate that the freestanding LSMO film is relaxed and ferromagnetic. The MCD peak positions vary by substrates, meaning that the band structure of LSMO is changed. The peak shifts to the lower energies with decreasing strains are possibly due to decreasing distorsion of electron orbitals in the LSMO thin films. These findings contribute to the realization of strongly correlated spintronics devices.