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Magnetoelastic Waves in Yttrium Iron Garnet

 

作者: W. Strauss,  

 

期刊: Journal of Applied Physics  (AIP Available online 1965)
卷期: Volume 36, issue 1  

页码: 118-123

 

ISSN:0021-8979

 

年代: 1965

 

DOI:10.1063/1.1713856

 

出版商: AIP

 

数据来源: AIP

 

摘要:

Magnetoeleastic pulses with variable echo time were observed in a rod of yttrium iron garnet. Data were taken at room temperature in the frequency interval 0.5 to 3.3 Gc/sec with input power in the milliwatt range. At a fixed carrier frequency, pulses were observed for external magnetic fields ranging over several hundred oersted; characteristically the echo time increased with decreasing field. The carrier frequency‐magnetic field‐echo time behavior can be explained in terms of a &thgr;=0 magnetoelastic disturbance traveling along the rod axis. It is launched at the position where &ohgr;c=&ggr;Hi. The disturbance propagates along the rod axis to the nearer end‐face where it is reflected. On arrival back at the launch site, a fraction of the energy is detected and the remainder reflected for another round trip. The process is repeated several times to give rise to a pulse sequence. The experimental results can be understood in terms of a magnetoelastic wave packet with calculated travel timeT=∫um−1dz≈∫us−1dz+∫ue−1dz, where the group velocities,u, refer to magnetoelastic, spin, and elastic waves, respectively. Spin‐wave loss has been included and gives improved agreement between theory and experiment.

 

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