Title :
Selective 2p-3d electron orbits exchange coupling in amorphous rare earth-transition metal-boron alloys
Author :
Kim, Jai-Young ; Hoffmann, Henry
Author_Institution :
Samsung Adv. Inst. of Technol., Suwon, South Korea
fDate :
9/1/1999 12:00:00 AM
Abstract :
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
Keywords :
Kerr magneto-optical effect; alloying additions; amorphous magnetic materials; boron alloys; demagnetisation; exchange interactions (electron); ferromagnetic materials; iron alloys; magnetic anisotropy; magnetic moments; magnetic thin films; magneto-optical recording; neodymium alloys; sputtered coatings; Fe sub-magnetic moment; NdFeB; amorphous (NdFe)100-XBX films; amorphous rare earth-transition metal-boron alloys; blue wavelengths; demagnetization energy; effective magnetic anisotropy energy; film planes; magneto-optic recording media; polar Kerr rotation angles; selective 2p-3d electron orbits exchange coupling; shape anisotropy; Amorphous materials; Demagnetization; Electrons; Iron; Magnetic films; Magnetooptic effects; Magnetooptic recording; Orbits; Perpendicular magnetic recording; Shape memory alloys;
Journal_Title :
Magnetics, IEEE Transactions on
