The magnetic properties of Tb-Fe-(B) thin films fabricated by rf magnetron sputtering

Y. S. Choi, Seong Rae Lee, S. H. Han, H. J. Kim, Sang Ho Lim

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The magnetic properties of giant magnetostrictive TbFe and TbFeB thin films are systematically investigated. The films were fabricated by rf magnetron sputtering using a composite target which consists of an Fe plate and Tb chips. The introduction of B to the films was done by using an Fe plate containing B. The microstructure, examined by X-ray diffraction, mainly consists of an amorphous phase and, at high Tb contents, a pure Tb phase also exists. A progressive change in the direction of anisotropy from the perpendicular to in-plane occurs as the Tb content increases from 35 to 68 at.% for the B-free TbFe films and from 44 to 67 at.% for the TbFeB thin films. The boundary at which the anisotropy change occurs shifts significantly towards to higher Tb contents when B is introduced to the films. The saturation magnetization exhibits a maximum at the Tb contents of 42 and 48 at.% and the values are about 5800 and 5100 G for the TbFe and TbFeB thin films, respectively. The coercive force, measured in the easy direction, decreases monotonically with the Tb content and ranges from 7.5 to 100 Oe when the films with in-plane anisotropy are considered. The magnetic softness of the present film which exhibits the coercive force of below 10 Oe and a typical squared-loop shape, and saturates at a low field of 1 kOe, is considered to be the best, to our knowledge, among this kind of thin films.

Original languageEnglish
Pages (from-to)155-162
Number of pages8
JournalJournal of Alloys and Compounds
Volume258
Issue number1-2
Publication statusPublished - 1997 Aug 1

Fingerprint

Magnetron sputtering
Magnetic properties
Thin films
Anisotropy
Coercive force
Saturation magnetization
X ray diffraction
Microstructure
Composite materials
Direction compound

Keywords

  • B addition
  • Coercive force
  • Giant magnetostriction
  • Magnetic softness
  • Saturation magnetization
  • Sputtering
  • Tb-Fe thin films

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

The magnetic properties of Tb-Fe-(B) thin films fabricated by rf magnetron sputtering. / Choi, Y. S.; Lee, Seong Rae; Han, S. H.; Kim, H. J.; Lim, Sang Ho.

In: Journal of Alloys and Compounds, Vol. 258, No. 1-2, 01.08.1997, p. 155-162.

Research output: Contribution to journalArticle

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