Magnetic properties of nanostructured CoPt and FePt thin films

Author

Jeong, Sangki ; Hsu, Yu-Nu ; Laughlin, David E. ; McHenry, Michael E.

Author_Institution

Mater. Sci. & Eng. Dept., Carnegie Mellon Univ., Pittsburgh, PA, USA

Volume

36

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

2336

Lastpage

2338

Abstract

Polycrystalline MgO underlayer films lead to different preferred orientations of L1₀ CoPt and FePt films after the annealing process, depending on the thickness of the L1₀ films. L1₀ films with a thickness greater than 20 nm revealed mostly L1₀ [100] fiber texture and consequently in-plane anisotropy as determined by magnetic hysteresis. Strong perpendicular anisotropy due to the L1₀ [001] fiber texture was obtained for thicknesses below 10 nm. The δM curve showed strong intergranular exchange coupling. The angular variation of coercivity showed the possibility of both domain wall motion and a rotational mechanism of magnetization reversal

Keywords

annealing; cobalt alloys; coercive force; exchange interactions (electron); ferromagnetic materials; iron alloys; magnesium compounds; magnetic anisotropy; magnetic domain walls; magnetic hysteresis; magnetic thin films; magnetisation reversal; nanostructured materials; perpendicular magnetic anisotropy; perpendicular magnetic recording; platinum alloys; surface texture; 10 to 20 nm; CoPt; FePt; L1₀ [001] fiber texture; L1₀ [100] fiber texture; MgO; annealing process; coercivity; domain wall motion; in-plane anisotropy; intergranular exchange coupling; magnetic hysteresis; magnetic properties; magnetization reversal; nanostructured CoPt thin films; nanostructured FePt thin films; polycrystalline MgO underlayer films; preferred orientation; rotational mechanism; strong perpendicular anisotropy; thickness; Anisotropic magnetoresistance; Magnetic films; Magnetic properties; Magnetization reversal; Perpendicular magnetic recording; Rapid thermal annealing; Reflection; Sputtering; Transistors; X-ray diffraction;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.908421

Filename

908421