Magnetoresistance and electronic structure of granular films with MgO or MgF2 matrices
Magnetoresistance and electronic structure of granular films with MgO or MgF2 matrices
复制标题
MgO 或 MgF2 基体颗粒薄膜的磁阻和电子结构
DOI：
10.1088/1742-6596/266/1/012087
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
T.Kobayashi
中科院分区：
文献类型：
--
作者：
Y.Fujiwara;H.Matsuda;K.Sato;M.Jimbo;T.Kobayashi
研究了FeCo-MgO、FeCoB-MgO、FeCo-MgF 2和FeCoB-MgF 2颗粒膜的磁输运性质和电子结构。从X射线光电子能谱（XPS）的测量，它被认为是在FeCo-MgO颗粒的表面上形成的氧化物层。特别是铁的氧化物优先形成。通过使用（Fe 50 Co 50）80 B 20，由于B被氧化而不是Fe，因此抑制了颗粒表面上Fe氧化物的形成。FeCoB-MgO的MR比约为2%。通过引入MgF 2基体，颗粒的表面状态得到了显著改善. XPS测试结果表明，FeCoB-MgF 2中金属Fe的含量较FeCoB-MgO有所增加。反映颗粒表面状态的改善，在FeCoB-MgF 2中获得约6%的大MR比。
The magneto-transport properties and electronic structures of FeCo-MgO, FeCoB-MgO, FeCo-MgF 2 and FeCoB-MgF 2 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 (Fe 50 Co 50) 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 MgF 2 matrix, the surface states of granules were drastically improved. XPS measurements indicated that an amount of metallic Fe in FeCoB-MgF 2 increased compared with FeCoB-MgO. Reflecting the improvement of surface states of granules, a large MR ratio of approximately 6% was obtained in FeCoB-MgF 2.