Magnetoresistance and electronic structure of granular films with MgO or MgF2 matrices

被引：5
|
作者：
Fujiwara, Y. [1 ]
Matsuda, H. [1 ]
Sato, K. [1 ]
Jimbo, M.
Kobayashi, T. [1 ]
机构：
[1] Mie Univ, Grad Sch Engn, Tsu, Mie 5148507, Japan
来源：
2ND INTERNATIONAL SYMPOSIUM ON ADVANCED MAGNETIC MATERIALS AND APPLICATIONS (ISAMMA 2010) | 2011年 / 266卷
关键词：
MAGNETIC TUNNEL-JUNCTIONS; SYSTEM; LAYER; FE; CO;
D O I：
10.1088/1742-6596/266/1/012087
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The magneto-transport properties and electronic structures of FeCo-MgO, FeCoB-MgO, FeCo-MgF2 and FeCoB-MgF2 granular films were investigated. From the X-ray photoelectron spectroscopy (XPS) measurements, it was recognized that the oxide layer formed on the surface of granules in FeCo-MgO. Especially Fe oxides were preferentially formed. By using (Fe50Co50)(80)B-20, the formation of Fe oxides on the granule surface was suppressed since B was oxidized instead of Fe. The MR ratio of FeCoB-MgO was approximately 2%. By using MgF2 matrix, the surface states of granules were drastically improved. XPS measurements indicated that an amount of metallic Fe in FeCoB-MgF2 increased compared with FeCoB-MgO. Reflecting the improvement of surface states of granules, a large MR ratio of approximately 6 % was obtained in FeCoB-MgF2.
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页数：5
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