High frequency soft magnetic performance on magnetically isotropic Co-Al-N films in external bias field

H. Kijima, Y. Zhang, N. Kobayashi, S. Ohnuma, H. Masumoto

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We have investigated the high frequency soft magnetic properties (μ-f properties) of magnetically isotropic Co 76Al 11N 13 films with an external bias field (H ex) applied in various directions. The films are prepared by rf sputtering and consist of fine Co grains 5 nm in diameter in an amorphous AlN matrix. The films have relatively large magnetic anisotropy perpendicular to the film plane and are magnetically soft. The initial magnetization curve in the film plane varies slightly with changes in the direction of the magnetizing field. A clear peak of permeability (μ″) was found at a resonance frequency (f r) around 2.5 GHz when the film had been magnetically saturated normal to the rf-field (H rf) in the film plane before measurement. After being magnetically saturated parallel to H rf, the film shows a broad peak in μ″ around 9 GHz; however f r decreases to 2.5 GHz with increasing H ex normal to the film plane. Control of f r between 2.5-9.65 GHz was achieved by changing the direction of H ex, which is attributed to the direction changes in magnetic moments of a magnetically isotropic film.

Original languageEnglish
Article number6332586
Pages (from-to)2910-2913
Number of pages4
JournalIEEE Transactions on Magnetics
Volume48
Issue number11
DOIs
Publication statusPublished - 2012 Oct 29

Keywords

  • High frequency
  • nitride film
  • resonance frequency
  • soft magnetic property

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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