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Structure and magnetic properties of FePt/Ag nano-granular films with perpendicular magnetic anisotropy

Yang Tao Feng Chun Zhai Zhong-Hai Zhu Feng-Wu Li Bao-He Hwang Pol

Structure and magnetic properties of FePt/Ag nano-granular films with perpendicular magnetic anisotropy

Yang Tao, Feng Chun, Zhai Zhong-Hai, Zhu Feng-Wu, Li Bao-He, Hwang Pol
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  • Received Date:  10 December 2004
  • Accepted Date:  06 January 2005
  • Published Online:  05 April 2005

Structure and magnetic properties of FePt/Ag nano-granular films with perpendicular magnetic anisotropy

  • 1. (1)北京科技大学材料物理与化学系,北京 100083; (2)北京科技大学材料物理与化学系,北京 100083;北京工商大学数理部,北京 100037; (3)北京科技大学材料物理与化学系,北京 100083;金日成综合大学物理系,朝鲜平壤

Abstract: [FePt 2 nm/Ag d nm]10 (d=0—11) multilayers were prepared on single crystal MgO(100) substrates kept at room temperature and 250 ℃ by means of magnetosputtering. L10-FePt/Ag granular films with perpendicular magn etic anis otropy and high coercivity have been obtained after vacuum annealing the multila yers deposited on substrates kept at 250 ℃ for 15 min. X-ray diffraction result s indicate that FePt particles have a strong [001] orientation. The size of Fe Pt particles decreases with the increase of the thickness of Ag layer. After vac uum annealing the [FePt 2 nm/Ag 9 nm]10 films at 600 ℃ for 15 min, FePt /Ag granular films are obtained with only 8 nm of particle size and 692 kA/m of coercivity. Isothermal magnetization remanence and dc-demagnetization remanence measurements show that no magnetic exchange coupling between magnetic particles can be observed. Such a kind of films is suitable for future ultra-density perp endicular magnetic recording medium.

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