• Title/Summary/Keyword: 자기적성질

Search Result 586, Processing Time 0.026 seconds

Li 단층의 전자적, 구조적 성질

  • 이재일;조이현;홍순철
    • Journal of the Korean Magnetics Society
    • /
    • v.3 no.3
    • /
    • pp.169-172
    • /
    • 1993

  • 총에너지 FLAPW(Full-Potential Linearized Augmented Plane Wave) 띠 방법을 이용하여 Li 단층의 구조적, 전자적 성질을 연구하였다. 삼각형 격자와 사각형 격자 구조에 대해 Wigner-Seitz의 반경 $r_{s}$를 변화시키면서 총에너지를 계산한 결과 삼각형구조가 안정하였으며, $r_{s}$가 3.7 a.u. 일때 평형이 되었다. 삼각형구조의 자성을 연구하기 위해, 스핀분극을 계산한 결과 $r_{s}$가 4.2 a.u. 일때 금속 강자성 전이가 일어나며 $r_{s}$가 5.3 a.u. 에서 완전 스핀분극이 되었다.

  • PDF

A Study on the Magnetic and Magneto-Optical Properties of Tb/Co Composition Modulated Multilayer Films (Tb/Co 조성변조 다층박막의 자기 및 광자기적 성질에 관한 연구)

  • 홍석지;김상록;이성래
    • Journal of the Korean Magnetics Society
    • /
    • v.6 no.3
    • /
    • pp.158-164
    • /
    • 1996

  • The magnetic and magneto-optical properties of the Tb/Co multilayers as a function of the layer thickness and the ratio of Tb/Co thicknesses were studied. When the thickness of Tb layer was $12{\AA}$, the maximum perpendicular anisotropy energy and the maximum thickness ratio which displays the perpendicular anisotropy were obtained. This result indicated that the Tb-Tb and Co-Co pairs as well as the Tb-Co pairs contribute to the perpendicular anisotropy. The Kerr rotation angle, $({\theta}_k)$ was proportional to the perpendicular anisotropy energy and was inversely proportional to the average spin dispersion angle, $(\alpha)$. The maximum $({\theta}_k)$ of $0.28^{\circ}$ was obtained in the film of $12{\AA}$ Tb and the thickness ratio of 1.55. The abnormal hysteresis loops were appeared during the aging treatment because the coercivity difference between the Co layer and the Tb layer was increased by the preferential oxidation of Tb.

  • PDF