Structural, magnetic, Mossbauer and magnetostrictive studies of amorphous Tb(Fe0.55Co0.45)(1.5) films

Citation
Nh. Duc et al., Structural, magnetic, Mossbauer and magnetostrictive studies of amorphous Tb(Fe0.55Co0.45)(1.5) films, J PHYS-COND, 12(38), 2000, pp. 8283-8293
Citations number
20
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF PHYSICS-CONDENSED MATTER
ISSN journal
09538984 → ACNP
Volume
12
Issue
38
Year of publication
2000
Pages
8283 - 8293
Database
ISI
SICI code
0953-8984(20000925)12:38<8283:SMMAMS>2.0.ZU;2-M
Abstract
Films with a nominal composition of Tb(Fe0.55Co0.45)(1.5) were fabricated b y rf-magnetron sputtering from a fixed target configuration at various Ar g as pressures. Samples were investigated by means of x-ray diffraction (XRD) , scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), conversion electron Mossbauer spectra (CEMS) and magnetostriction measureme nts. As the Ar pressure increases, the Tb and Fe content increases slightly , whereas the Co content decreases. In addition, a small amount of Ar is in troduced into the films. The as-deposited films are amorphous alloys, but t heir magnetic behaviour depends strongly on the deposition conditions: a pe rpendicular magnetic anisotropy is obtained only in film deposited at lowes t Ar pressure and a parallel magnetic anisotropy exhibits in remaining film s. These samples show an intrinsic magnetostriction (lambda approximate to 10(-3)) in an applied field of 0.7 T. In this state, it was determined that the hyperfine field reaches the value B-hf = 24.5 T. Effects of the heat t reatment on the magnetostrictive softness are also reported. The parallel m agnetostriction with a huge magnetostrictive susceptibility (chi(lambda) = 1.8 X 10(-2) T-1) obtained at (mu(0)H = 10 mT) makes these materials useful for applications.