Intrinsic angular investigations on metal evaporated tapes

Abstract

Demagnetisation compensated torque-and angle-dependent remanence measurements are presented on commercial and experimental metal evaporated tapes. The latter have been prepared in our laboratory on a mini-roll coater system. From these results the easy axes have been determined.

Metal Evaporated Media

“…The intrinsic anisotropy angle is found to be approximately aligned with the average direction of the columns estimated to be 40 from TEM measurements (Kohmoto, 1997;Samwel et al, 1996). However, the columns are not what dictate the medium anisotropy.…”

“…The variations of the intrinsic coercivity and squareness peak to minimum values at about 133 , which corresponds to the hard axis direction. The intrinsic anisotropy axis is for this medium tilted at an angle of about 38 with respect to the film plane (Bernards and Cramer, 1991;Hokkyo et al, 1993;Richter, 1993a;Samwel et al, 1996). Note that without demagnetization compensation, the anisotropy axis is found to be 10 smaller (Bernards and Cramer, 1991;Hokkyo et al, 1993;Richter, 1993a;Samwel et al, 1996).…”

Local magnetic anisotropy control in NiFe thin films via ion irradiation

“…11,12 Each sample was mounted with its inplane easy axis in a consistent direction relative to the two mutually perpendicular pickup coils of a vector VSM. With the sample and pickup coils fixed, the applied field direction could be rotated in increments of 0.1°over all angles in the plane of the sample.…”