Magnetic torque behavior and rotational hysteresis of amorphous uniaxial Sm-Co alloy films
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Amorphous films of Sm100−xCo x with 70≦x≦90 were made by vapor deposition on flat glass substrates at 300 K with a magnetic field parallel to the film plane, as described in a preceding paper; the field induces a uniaxial anisotropyK u of the order 106 erg cm−3 with the easy axis,x, in the film plane. The film plane (xy plane) is the easy plane with a planar anisotropyK p of the order 107 erg cm−3, i.e. the film normal,z, is the hard axis. For such films, torque curvesT(H, Θ) (Θ: angle betweenH and an axis normal to the axis of rotation) are calculated, and are measured in fieldsH ≦ 30 kOe for the three axes of rotation,x, y, andz. The results are evaluated to give the “spontaneous magnetization”, 〈M〉, the anisotropies,K u ,K p , the rotational hysteresis losses,W Rx (H),W Ry (H),W Rz (H), and the rotational hysteresis integrals,R x ,R y ,R z .
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