ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Co100−xNix (x=70, 75, 80, 90 at. % Ni) alloy films were made by the vapor deposition method. An easy axis could be defined by a deposition field parallel to either the length (L film) or width (T film) of the sample. The anisotropic magnetoresistance (AMR) and the planar Hall effect (PHE) hysteresis loops were simultaneously measured with a slowly sweeping field H. The angle θ between the hard axis and H could be varied. Domain patterns were also recorded at each stage of the magnetization or demagnetization process. Besides the usual AMR and PHE behaviors, we have observed the forms of a voltage "mountain," like ΔVmr and ΔVph, superimposed on the normal curves at the switching field Hsw. ΔVmr is an even function of θ and ΔVph is an odd function. The well known magneto-transport theory based on the single-domain model is modified to adopt the real situation of the multidomain structure. We have been successful in explaining all the ΔVph data observed experimentally. In addition, from the angular dependence of ΔVph, we not only check the direction of the mean easy axis consistently, but also tell the degree of easy-axis dispersion in the film. It is found that the Co30Ni70 T film has the least dispersion and a sizable AMR ratio Δρ/ρ⊥=3.6% at room temperature.© 1998 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.368145
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