Title :
Magnetic force microscopy (MFM) studies of micromagnetic structures of high coercivity CoCrPt/Cr and CoCrPtB/Cr thin films
Author :
Glijer, Pawel ; Sivertsen, John M. ; Judy, Jack H.
Author_Institution :
Center for Micromagnetics & Inf. Technol., Minnesota Univ., Minneapolis, MN, USA
fDate :
11/1/1995 12:00:00 AM
Abstract :
The magnetic microstructures of high coercivity CoCrPt/Cr and CoCrPtB/Cr films were investigated using magnetic force microscopy (MFM). Experiments show that the MFM technique can be used for both qualitative and quantitative description of the magnetic microstructure of high coercivity films for magnetic recording media. It was found that the magnetic microstructure was more refined for films with higher coercivity. The roughness of the magnetic images tend to decrease with increasing coercivity and decreasing media noise. Magnetic images obtained for films with ac-erased state consisted of rounded, symmetric features indicating presence of magnetic vortices. Images from samples in remanent coercivity state showed elongated transitions between regions with different magnetization direction
Keywords :
boron alloys; chromium; chromium alloys; cobalt alloys; coercive force; ferromagnetic materials; magnetic force microscopy; magnetic recording; magnetic thin films; microscopy; platinum alloys; CoCrPt-Cr; CoCrPtB-Cr; ac-erased state; high coercivity thin films; magnetic force microscopy; magnetic images; magnetic recording media; magnetic vortices; magnetization; micromagnetic structures; noise; remanent coercivity state; Chromium; Coercive force; Magnetic anisotropy; Magnetic field measurement; Magnetic films; Magnetic force microscopy; Magnetic forces; Magnetic noise; Micromagnetics; Perpendicular magnetic anisotropy;
Journal_Title :
Magnetics, IEEE Transactions on
