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Selective 2p-3d electron orbits exchange coupling in amorphous rare earth-transition metal-boron alloys

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2 Author(s)
Kim, Jai-Young ; Samsung Adv. Inst. of Technol., Suwon, South Korea ; Hoffmann, H.

One of the major bottlenecks in amorphous light rare earth-transition metal (LRE-TM) alloy films for magneto-optic (MO) recording media in blue wavelengths (~400 nm) is the large demagnetization energy (ED), which originates from shape anisotropy of the samples and decreases the effective magnetic anisotropy energy KUeff perpendicular to the film planes. The reduction of this demagnetization energy and enhancement of polar Kerr rotation angles (θK) are attempted by the addition of boron (B) into the amorphous LRE-TM films, such as amorphous (NdFe)100-XBX films. The additive B plays the role of reducing an Fe sub-magnetic moment by selective 2p-3d electron orbits exchange coupling (SEC) between B and Fe. The SEC results in the reduction of ED, enhancement of KUeff and increase of θK in the amorphous (NdFe)100-XBX alloy films

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )