Abstract

Dr. András Kovács
The Institute of Scientific and Industrial Research,
Osaka University, Japan

Seminar: January 15, 2007
3:30-4:30pm
Mechanical Engineering, Room 341

Fabrication and structural characterization of L10-ordered magnetic nanoparticles: Effect of Co addition to FePd

An L10 type (AuCu I) magnetic nanoparticle is attractive as a material for ultrahigh density magnetic recording media due to its high uniaxial magnetic anisotropy energy. In this work the effect of Co addition on the atomic ordering and hard magnetic properties of nanocrystalline Pd-Fe layers have been investigated by transmission electron microscopy (TEM) and by superconducting quantum interference device (SQUID) magnetometry. Nanoparticles were prepared in a high vacuum electron beam evaporation system. Formation of the L10-ordered phase and the order-disorder transformation were studied by in-situ TEM annealing. Structural analysis of the specimens revealed that the Co addition enhanced the easy-axis (c-axis of the tetragonal structure) alignment and decreased the ordering temperature. Magnetic property analyses show that the saturation magnetization is also increased in L10-PdCoFe nanoparticles.

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