Interfacial ferromagnetism and atomic structures in high-temperature grown Fe
O
/Pt/Fe
O
epitaxial trilayers
高温成長したFe
O
/Pt/Fe
O
エピタキシャル三層膜における界面強磁性と原子構造
吉川 貴史*; 鈴木 基寛*; Ramos, R.*; Aguirre, M. H.*; 岡林 潤*; 内田 健一*; Lucas, I.*; Anad
n, A.*; 菊池 大介*; Algarabel, P. A.*; Morell
n, L.*; Ibarra, M. R.*; 齊藤 英治
Kikkawa, Takashi*; Suzuki, Motohiro*; Ramos, R.*; Aguirre, M. H.*; Okabayashi, Jun*; Uchida, Kenichi*; Lucas, I.*; Anad
n, A.*; Kikuchi, Daisuke*; Algarabel, P. A.*; Morell
n, L.*; Ibarra, M. R.*; Saito, Eiji
Induced Pt ferromagnetism in Fe
O
/Pt/Fe
O
epitaxial trilayer films has been investigated by means of X-ray magnetic circular dichroism (XMCD) at the Pt
-edges at various temperatures from 300 K to 12 K, including the metal-insulator transition temperature of Fe
O
(
K). At all the temperatures, we observed clear XMCD signals due to Pt ferromagnetism, the amplitude of which was determined to be 0.39
at 300K and 0.52
at 12 K for the sample with the Pt thickness of
nm. Interestingly, these values are comparable to or even greater than those in Pt/3
-ferromagnetic-metal (Fe, Ni, Co, and Ni
Fe
) junction systems. The results can be interpreted in terms of a possible Fe interdiffusion into the Pt layer and also possible Fe-Pt alloying due to its high-temperature deposition.