Digitale Medien
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
61 (1987), S. 3161-3161
ISSN:
1089-7550
Quelle:
AIP Digital Archive
Thema:
Physik
Notizen:
CoCr films with the nominal composition of 20 at. % Cr were rf sputtered onto a glass substrate as a function of both substrate temperature (Ts) and argon pressure (PAr). By controlling the process parameters, both positive effective and in-plane anisotropy films can be obtained. The angular variation of the coercivities of these films (which serves as a test of the possible coercivity mechanisms) has been measured.1 We found that no unique correspondence exists between our experimental data and Wuori's theoretical models of the reversal mechanism.2 By changing the substrate temperature, a family of monotonically decreasing, angular-dependent coercivity curves are obtained. The perpendicular film made at low Ts and PAr shows a slowly decreasing dependence of the coercivity as a function of the field angle. Furthermore, the easy-axis hysteresis loop displays a reentrant magnetization effect. The complexity of the magnetization reversal process is attributed to nonhomogeneous crystal structure. (All of these films exhibit evidence of a soft magnetic underlayer.) Ferromagnetic resonance (FMR) spectra measured at 9.8 and 35.2 GHz show multiple resonance structures. The anisotropy constant of the films become increasingly more negative with increasing argon pressure and/or substrate temperature. These results are consistent with bulk magnetic measurements made by vibrating sample magnetometry and microstructural observations using transmission electron microscopy.3 Details of the structural characterization by FMR and its implication on the coercivity mechanism will be presented.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1063/1.337827
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