Title :
Asymmetry of hysteresis properties of the layers in double layered exchange coupled magnetic films
Author :
Dvorkina-Samarskaya, A. ; Suckomlin, V. ; Dvorkin-Samarsky, M. ; Ivanova, E.
Author_Institution :
Magnetic Res. Lab., Teacher Training Inst., Irkutsk, Russia
fDate :
11/1/1993 12:00:00 AM
Abstract :
The switching of amorphous double layered binary and ternary rare-earth (RE) cobalt alloy films with perpendicular anisotropy in the layers is studied. Specimens are prepared by ion-plasma sputtering in Ar atmosphere on glass or silicon substrates. Hysteresis loops are measured from both sides of the film by the polar Kerr effect method. An X-ray diffractometer and an Auger electron spectrometer are used for structure investigation and composition analysis. A microdispersed polycrystalline RE oxide region with a thickness of about 10 nm are detected both on the free surface of the film and on the interlayer boundary. It is found that neither oxidized interlayer nor the surface influences the switching of the upper layer, but that hysteresis loops from down one strongly distort when exposition time exceeds five minutes. An explanation of the pecularities of the switching mechanism of oxidation of the film surface is proposed
Keywords :
Auger effect; Kerr magneto-optical effect; X-ray diffraction examination of materials; amorphous state; cobalt alloys; ferromagnetic properties of substances; gadolinium alloys; magnetic hysteresis; magnetic multilayers; magnetic properties of amorphous substances; magnetic thin films; oxidation; praseodymium alloys; sputtered coatings; terbium alloys; (Gd45Tb45Pr10)20Co 80-(Gd45 Tb45Pr10)23 Co77; Ar atmosphere; Auger electron spectrometer; Gd22Co78-Gd19Co81; GdCo; GdTbPrCo; Si substrate; X-ray diffractometer; amorphous doubled layered ternary rare earth Co alloy films; composition analysis; double layered exchange coupled magnetic films; free surface; glass substrates; hysteresis loops; hysteresis properties; interlayer boundary; ion-plasma sputtering; microdispersed polycrystalline rare earth oxide region; oxidation; oxidized interlayer; perpendicular anisotropy; polar Kerr effect method; structure investigation; switching mechanism; upper layer; Amorphous materials; Anisotropic magnetoresistance; Argon; Atmosphere; Cobalt alloys; Glass; Hysteresis; Silicon; Sputtering; Substrates;
Journal_Title :
Magnetics, IEEE Transactions on