Title :
Switching field distributions and ΔM measurements for perpendicular media
Author :
Van de Veerdonk, René J M ; Wu, Xiaowei ; Weller, Dieter
Author_Institution :
Seagate Res., Pittsburgh, PA, USA
fDate :
9/1/2002 12:00:00 AM
Abstract :
A new experimental method has recently been proposed to determine the switching field distribution for perpendicular media. The advantage of the new technique is that it separates the effects of the switching field distribution and the effective demagnetization factor, which are difficult to estimate independently. In this paper, this methodology is extended to the ΔM measurement, which is an indicator for intergranular exchange interactions. We present the magnetic properties for a set of CoCrPt alloy media and a set of [CoX-Pd]N based multilayer perpendicular media. We correlate the effective demagnetization factor and the width of the switching field distribution to the exchange interaction and recording performance.
Keywords :
chromium alloys; cobalt alloys; demagnetisation; exchange interactions (electron); ferromagnetic materials; magnetic multilayers; magnetic switching; palladium; perpendicular magnetic recording; platinum alloys; ΔM measurements; CoCrPt; CoCrPt alloy media; [CoX-Pd]N based multilayer perpendicular media; effective demagnetization factor; intergranular exchange interactions; perpendicular media; recording performance; switching field distributions; Demagnetization; Elementary particle exchange interactions; Magnetic field measurement; Magnetic recording; Magnetic separation; Magnetic switching; Magnetization; Perpendicular magnetic recording; Remanence; Switches;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.803589