Dan LI
,
Yousong GU
,
Zuoren NIE
,
Bo WANG
,
Hui YAN
材料科学技术（英文）
Pseudo-potential and plane wave basis-set under the framework of density functional theory have been employed to study the electronic and magnetic properties of Fe16N2, and to have an insight look on the subject of giant magnetic moments reported in Fe16N2. After geometrical optimization, band structures and densities of states have been evaluated together with the atom resolved band populations and magnetic moments. In this paper, we report a theoretical effort to look into the various aspects of the magnetic properties of Fe16N2, including volume effect and distortion effect.
关键词:
Ab initio calculations
,
磁学性能
,
Fe16N2系统
Dan LI
,
Yousong GU
,
Xiangrong CHANG
,
Fushen LI
,
Lijie QIAO
,
Zhongzhuo TIAN
材料科学技术（英文）
200 nm thick Fe-N magnetic thin films were deposited on glass substrates by RF sputtering. The as-deposited films have high saturation magnetization but their coercivity is also higher than what is needed Therefore it is very important to reduce coercivity. The samples were vacuum annealed at 250 °C under 12000 A/m magnetic field. When the N content was in the range of 5~7 at.pct, the thin films consisted of α'+α'' after heat treatment and had excellent soft magnetic properties of 4πM2=2.4 T, Hc<80 A/m. However, the thickness of a recording head was 2 μm, and Hc increased as thickness increased. In order to reduce the Hc, the sputtering power was raised from 200 W to 1000 W to reduce the grain size. 2 μm Fe-N thin films were vacuum annealed under the same condition, when the N content was in the range of 5.9~8.5 at.pct, the thin films kept its excellent magnetic properties of 4πM2=2.2 T, Hc<80 A/m. The properties of the films meet the need of a recording head material used in the dual-element GMR/inductive heads.
关键词:
Fe-N
,
null
,
null
