ヤナセ　タカシ   Yanase Takashi   柳瀨　隆    所属   東邦大学  理学部 化学科    職種   講師
論文種別	原著
言語種別	英語
査読の有無	査読あり
表題	Characterization of magnetic properties of ultrathin CoFe<inf>2</inf>O<inf>4</inf> films by utilizing magnetic proximity effect
掲載誌名	正式名：Solid State Communications ISSNコード：0038-1098
巻・号・頁	306
著者・共著者	S. Nodo,T. Yamamoto,T. Yanase,T. Shimada,T. Nagahama
発行年月	2020/02
概要	© 2019 Elsevier Ltd Magnetic spinel oxides, including CoFe2O4 (CFO), have crucial applications in spintronics. They have excellent magnetic properties, such as high spin polarization and high Curie temperature, which enables the operation of spintronic devices at room temperature. Some interesting phenomena have also been discovered for interfaces consisting of spinel oxides and heavy metals. However, the magnetic properties of ultrathin CFO films have not been investigated sufficiently. In this report, a characterization of the magnetic properties of an ultrathin CFO film was performed by using the magnetic proximity effect (MPE) to observe the anomalous Hall effect (AHE) in Pt. The result was consistent with the measurement performed with magneto-optical effects. By fitting AHE with the Langevin function, it was concluded that these ultrathin films (tCFO<3.4 nm) showed superparamagnetism, and the magnetic moment was estimated to be 3000μB. The results provided the novel method to evaluate the magnetic properties of ferromagnetic insulators by using MPE and AHE, thus providing a better understanding of interface magnetism.
DOI	10.1016/j.ssc.2019.113762