Title :
High-frequency ferromagnetic resonance in Nd2Fe14 B/α-Fe nanocomposite films
Author :
Kato, H. ; Ishizone, M. ; Miyazaki, T. ; Koyama, K. ; Nojiri, H. ; Motokawa, M.
Author_Institution :
Dept. of Appl. Phys., Tohoku Univ., Sendai, Japan
fDate :
7/1/2001 12:00:00 AM
Abstract :
Thin-film magnets, composed of nanophase dispersed Nd2Fe14B and α-Fe have been synthesized by rf magnetron sputtering. With increasing α-Fe volume fraction V Fe, the saturation magnetization increased linearly, while the coercivity decreased. Ferromagnetic resonance measurements were made by using a high-frequency and high-field ESR apparatus, which exhibited two absorption peaks. A model calculation of the resonance field was made for a simplified hard/soft two-sublattice system to analyze these results. Estimated values of the exchange-coupling constant are in good agreement with those deduced from micromagnetic analysis of the magnetization curves
Keywords :
boron alloys; coercive force; composite materials; exchange interactions (electron); ferromagnetic resonance; iron; iron alloys; magnetic thin films; magnetisation; nanostructured materials; neodymium alloys; sputtered coatings; Nd2Fe14B-Fe; Nd2Fe14B/α-Fe nanocomposite thin film magnet; RF magnetron sputtering; coercivity; exchange coupling constant; hard/soft two-sublattice system; high-frequency ferromagnetic resonance; micromagnetic analysis; saturation magnetization; volume fraction; Coercive force; Iron; Magnetic analysis; Magnetic field measurement; Magnetic resonance; Magnets; Neodymium; Paramagnetic resonance; Saturation magnetization; Sputtering;
Journal_Title :
Magnetics, IEEE Transactions on
