Magnons and acoustic phonons in Y3ÀxBixFe5O12
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چکیده
We use Brillouin light scattering ~BLS! to study a series of single-crystal Bi-doped yttrium iron garnet Y32xBixFe5O12 ~Bi-YIG! prepared with x5 0, 0.14, 0.36, 0.54, and 0.92. BLS shows that the optimal laser power should be as low as possible, <5 mW. BLS manifests the Bi-concentration dependence of the magnetic and mechanic properties of Bi-YIG. Two bulk magnons are observed. One is the thermally excited magnon and another is the uniform magnetostatic mode. The stiffness constant Dex , the relative intensity and bandwidth ~full width at half maximum! of the thermally excited bulk magnon all increase linearly with x, while 4pM s is insensitive to doping. On the contrary, the scattering intensity and the sound velocity of the acoustic phonon decrease.
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تاریخ انتشار 2001