We have investigated magnetic field effects on mechanical vibration of a magnetic microbridge made of ferrimagnetic insulator Y3Fe5O12 at room temperature. The mechanical resonance frequency of the bridge exhibits a steep change at the saturation magnetic field of the microbridge. The steep change was shown to originate from magnetoelastic coupling combined with shape magnetic anisotropy. The competition between shape magnetic anisotropy and the external magnetic field can drive a delta-E effect, the modulation of Young modulus via the magnetoelastic coupling, in a narrow field range, which results in the observed steep change in the mechanical property.
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