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Structure and Anomalous Magnetic Properties in Fe-N/Ti-N Nano-multilayers

Zhenjun WANG , Xiangrong CHANG , Yousong GU , Zhongzhuo TIAN and Jimei XIAO (Uuiversity of Science and Technology Beijing , Beijing 100083 , China)Lishi WEN (Institute of Metal Research , Chinese Academy of Sciences , Shenyang 110015 , China)(To whom corresponden

材料科学技术(英文)

DC-magnetron sputtering was employed to prepare Fe-N/Ti-N periodic nano-multilayers . Magnetic properties were studied by vibrating sample magnetometry and structure by TEM and X-ray diffraction for the films. A strong enhancement of the saturation magnetization was found in multilayers containing thinner Fe-N layers. The coercivity was found to be nearly constant. A kind of anomalous hysteresis loops was found in some samples

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Reduction of Coercivity of Fe-N Soft Magnetic Film by Heat Treatment

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

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