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No.3(pp.67-109)

Home > Issues > Volume 3 (1998) > No.3(pp.67-109)

Novel Properties of Boron Added Amorphous Rare Earth-transition Metal Alloys for Giant Magnetostrictive and Magneto-optical Recording Materials

Journal of Magnetics, Volume 3, Number 3, 30 Sep 1998, Pages 78-81

Jai-Young Kim(Samsung Advanced Institute of Technology)

Abstract

Large magneto crystalline anisotropy energy and demagnetization energy of rare earth-transition metal (RF-TM) alloys play roles of bottlenecks towards their commercial applications for giant magnetostrictive and blue wavelength magneto optical recording materials, respectively. To solve the above problems, boron is added into amorphous RE-TM alloys to produce its electron transferring. The boron added amorphous RE-TM alloys show novel magnetic and magneto-optical properties as follows; 1) an amorphous (Sm₃₃Fe₆₇)₉₇B₃ alloy obtains the magnetostriction of -550×10^-6at 400 Oe compared with saturation magnetostriction of -60×10^-6in conventional Ni based alloys, 2) an amorphous (Nd₃₃Fe₆₇)₉₅B₅alloy increases effective magnetic anisotropy to -0.5×10⁶ergs/cm³from -3.5×10⁶ergs/cm³without boron, which correspond to the polar Kerr rotation angles of 0.52˚ and 0.33˚, respectively. These results attribute to selective 2p-3d electron orbits exchange coupling (SEC).

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