Magnetism of Amorphous Bulk $(Sm_{1-x}Pr_x)Fe_2$ Alloys in a Low Magnetic Field

저자장에서 비정질 후막$(Sm_{1-x}Pr_x)Fe_2$의 자성

  • Kim, Jai-Young (Technology Strategy Research Center, Sam-Sung Advanced Institufe of Technology)
  • Published : 1995.12.01

Abstract

RFe$_2$(R=rare earth) Laves Phase intermetallic compounds are one of the promising materials for magnetostrictive applications, due to large magnetostriction coefficients in the order of 10$^{-3}$ . However, because RFe$_2$intermetallic compounds have large magnetostriction constants as well as large magnetocrystalline anisotropy constants, a large external magnetic field is necessary to reach saturation magnetostriction. Hence researches on giant magnetostriction have been concentrated on producing materials exhibiting a high value of magnetostriction in a low magentic field. The main research trend of the giant magnetostriction to obtain the large value in the low magnetic filed, fortunately as the signs of magnetocrystalline anisotropy constans in RFe$_2$intermetallic compounds alternate with the rare earth metals, has been to substitute the rare earth metal for others and hence to reduce the magnetocrystalline anisotropy energy. In addition, amorphous RFe$_2$alloys have been researched. In this research, both of the methods which are substitution of the rare earth metal and amorphization in RFe$_2$ intermetallic compounds are simultaneously conducted to obtain the large magnetostriction coefficient in the low external magnetic field. Among them, SmFe$_2$and PrFe$_2$are selected, and amorphized in substrate-free bulk state. Magnetism in amorphous bulk (Sm$_{1-x}$ Pr$_{x}$) Fe$_2$alloys is investigated in the low magnetic field.ld.

RFe$_2$(R=rare earth) Laves상 금속간 화할물은 $10^{-3}$ 정도의 큰 포화 자왜 정수를 나타내고 있어, 자왜 재료의 응용 분야에서 많은 주목을 받고 있다. 그러나, 이 금속간 화합물은 결정 자기 이방성 에너지가 크기 때문에, 큰 포화 자왜 정수를 얻기 위해서는 높은 외부 자장이 요구되어진다. 이에 따라 저자장에서 보다 높은 자왜 정수를 얻고자 하는 연구들이 행하여 지고 있는데, 이를 위한 방법은 RFe$_2$Laves상 금속간 화합물중 결정 자기 이방성 부호가 각기 다른 회토류 금속의 치환 혹은 RFe$_2$금속간 화합물의 비정질화이다. 본 연구에서는 RFe$_2$금속간 화합물의 자기 이방성 에너지를 최소화하여 저자장에서 높은 자왜 정수를 얻기 위해, 결정 자기 이방성 정수 및 자왜 정수의 부호가 각각 반대인 SmFe$_2$와 PrFe$_2$을 합금화 한후, 비정질화하여 자왜 정수의 변화를 포함한 자성을 조사하였다.

Keywords

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