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Magnetostatic Spin Wave in a Very Thin CoFeB Film Grown on an Amorphous FeZr Buffer Layer
김동석,Kohei Nawaoka,Shinji Miwa,박승영,Yoichi Shiota,유천열,조재훈,이병찬,Yoshishige Suzuki,이긍원 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.5
The transmission of a magnetostatic spin wave in a very thin CoFeB film (2.3 nm) grown on an amorphous paramagnetic FeZr layer was demonstrated for the first time by using an antenna method with coplanar waveguides. The attenuation length, determined by using the difference in intensities due to a change in the distance between the antennas, was estimated to be 0.7 μm. We discuss why we are able to observe spin-wave propagation in such a thin magnetic layer, taking the low damping constant ( = 0.0027) of the CoFeB films grown on the amorphous FeZr layer and the estimated large group velocity in the CoFeB films into account.