VNU-UET Repository: No conditions. Results ordered -Date Deposited.
2024-03-29T09:26:55Z
EPrints
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2013-03-27T06:31:46Z
2013-04-01T06:59:47Z
http://eprints.uet.vnu.edu.vn/eprints/id/eprint/142
This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/142
2013-03-27T06:31:46Z
Structural and Magnetic Studies of Sputtered Fe1-xCrx Thin Films
X-ray diffraction, magnetization, and Mössbauer effect investigations have been performed for sputtered Fe1-xCrx (0≤x≤0.54) thin films. The body-centered-cubic (bcc) phase appears for x≪0.32, while the σ phase is formed for 0.38≤x≤0.44. For 0.32≤x≪0.38 and 0.44≪x≤0.54, the samples are composed of both bcc and σ phases. As the Cr concentration increases, the ferromagnetic fraction, magnetization, and magnitude of the hyperfine field decrease, whereas the magnitude of the isomer shift increases. The Fe and Cr magnetic moments, isomer shift, and hyperfine field of the bcc Fe–Cr phase have been deduced and are discussed consistently in terms of charge and spin distributions, as well as magnetic valence. © 2000 American Institute of Physics.
N.H. Duc
ducnh@vnu.edu.vn
A. Fnidiki
J. Teillet
J.Ben Youssef
H. Le Gall
2013-03-27T06:28:52Z
2013-04-01T06:58:48Z
http://eprints.uet.vnu.edu.vn/eprints/id/eprint/141
This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/141
2013-03-27T06:28:52Z
Magnetic and Magnetostrictive pProperties in Amorphous (Tb0.27Dy0.73)(Fe1-xCox)2 Films
Magnetic and magnetostrictive properties have been investigated for amorphous (Tb0.27Dy0.73)(Fe1-xCox)2 thin films. An increase in the 3d magnetic moment due to the enhancement of T–T interactions in substituted (Fe, Co) alloys was found. This leads to stronger R–(Fe, Co) exchange energies and then to enhancements of R–sublattice magnetization as well as magnetostriction in these amorphous R(Fe, Co) thin films. In addition, a well-defined in-plane anisotropy is created by magnetic-field annealing for the Co-rich films. A large magnetostriction of 480×10-6 developed in low fields of 0.3 T was observed for films with x=0.47 after magnetic-field annealing. The differing roles of Fe and Co atoms on the magnetization process have also been discussed. © 2000 American Institute of Physics.
N.H. Duc
ducnh@vnu.edu.vn
K. Mackay
J. Betz
D. Givord
2013-03-27T06:27:03Z
2013-04-01T06:59:25Z
http://eprints.uet.vnu.edu.vn/eprints/id/eprint/143
This item is in the repository with the URL: http://eprints.uet.vnu.edu.vn/eprints/id/eprint/143
2013-03-27T06:27:03Z
Magnetic, Mossbauer and magnetostrictive studies of amorphous Tb(Fe0.55Co0.45)1.5 films
The Tb(Fe0.55Co0.45)1.5 films were fabricated by rf magnetron sputtering from a composite target. Samples were investigated by means of x-ray diffraction, vibrating sample magnetometer, conversion electron Mössbauer spectra, and magnetostriction measurements. The as-deposited film is an amorphous alloy with a perpendicular magnetic anisotropy and an intrinsic magnetostriction λ=1080×10-6 in an applied field of 0.7 T. In this state, it was determined that the hyperfine field Bhf=23.5 T and the cone-angle between the Fe moment direction and the film-normal direction β=12°. After annealing in the temperature range of TA=250–450 °C the amorphous structure still remained, however the anisotropy was changed to a parallel one. The soft magnetostrictive behavior has also been improved by these heat treatments: the parallel magnetostriction λ||=465×10-6 was almost developed in low applied fields of less than 0.1 T and, especially, a huge magnetostrictive susceptibility χλ=dλ||/d(μ0H)=1.8×10-2 T-1 was obtained at μ0H=15 mT. © 2000 American Institute of Physics.
T.M. Danh
danhtm@vnu.edu.vn
N.H. Duc
ducnh@vnu.edu.vn
H. N. Thanh
J. Teillet