| dc.description.abstract | We report on the magnetic properties, superconductivity and magnetic relaxation
behaviors in the nano-sized Sn@Ni core@shell particles. The Sn@Ni NPs were
fabricated employing the gas-condensation method, using a chamber equipped with two
decoupled evaporation sources for separate evaporation of Sn or Ni. We use X-ray
diffraction pattern, energy-dispersive X-ray spectroscopy and transmission electron
microscopy, resulting in a mean particle core diameter of 2.4 nm and shell thickness of
1.9 nm.
In applied magnetic field Ha = 200 Oe, the blocking temperature TB of Sn@Ni is 43
K; Ha = 1 kOe, TB = 6 K; Ha = 5 kOe, TB = 2.4 K. Doing χ(T) experiment, Sn@Ni has
weak spin glass behavior and the critical magnetic field Hc0 = 2.9 kOe.
The study of magnetic relaxation behaviors of Sn@Ni NPs had inverse magnetization
behavior. It related to core@shell structure and it depended on temperature, applied
magnetic field, and turning the Ha off. M(t) should have two components: remanent
magnetization Mr and Faraday inductive magnetization Mi.
At last, we made a comparison between Sn@Ni and Au@Ni. The ratio of Faraday
inductive magnetization Pi0 of Sn@Ni had much stronger than Au@Ni. | en_US |