INVESTIGATION OF MICROMAGNETISM AND MAGNETIC REVERSAL OF NI NANOPARTICLES USING A MAGNETIC FORCE MICROSCOPE

Citation
Aa. Bukharaev et al., INVESTIGATION OF MICROMAGNETISM AND MAGNETIC REVERSAL OF NI NANOPARTICLES USING A MAGNETIC FORCE MICROSCOPE, Physics of the solid state, 40(7), 1998, pp. 1163-1168
Citations number
19
Categorie Soggetti
Physics, Condensed Matter
Journal title
ISSN journal
10637834
Volume
40
Issue
7
Year of publication
1998
Pages
1163 - 1168
Database
ISI
SICI code
1063-7834(1998)40:7<1163:IOMAMR>2.0.ZU;2-L
Abstract
Isolated Ni nanoparticles were studied in situ by atomic and magnetic force microscopy in the presence of an additional external field up to 300 Oe. By comparing topographic and magnetic images, and also by com puter modeling of magnetic images, it was established that particles s maller than 100 nm are single-domain and easily undergo magnetic rever sal in the direction of the applied external magnetic field. For large magnetic particles, the external magnetic field enhances the magnetiz ation uniformity and the direction of total magnetization of these par ticles is determined by their shape anisotropy. Characteristics of the magnetic images and magnetic reversal of particles larger than 150 nm are attributed to the formation of a vortex magnetization structure i n these particles. (C) 1998 American Institute of Physics.