The detection of magnetic phase transitions in single crystals of erbium and erbium-thulium by electromagnetic acoustic transducers
UNSPECIFIED (1998) The detection of magnetic phase transitions in single crystals of erbium and erbium-thulium by electromagnetic acoustic transducers. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 31 (11). pp. 1362-1367. ISSN 0022-3727Full text not available from this repository.
Measurements of ultrasonic shear wave velocity as a function of temperature and applied magnetic field have been performed on single crystals of Er and Er91.6%Tm8.4%. Electromagnetic acoustic transducers (EMATs) are used to generate and detect the in-plane radially polarized shear wave. The shear wave is propagated down the c axis of the hexagonal close packed single crystal samples. The EMAT acoustic coupling efficiency has been observed to increase close to the magnetic phase transition temperatures, showing the dominance of the magnetoelastic interactions over the applied-field-dependent Lorentz force mechanism in these samples. Measurement of the EMAT acoustic coupling efficiency is identified as a promising technique for identifying magnetic phase transitions. Because the ultrasound measurement technique is a non-contact one, problems associated with acoustic couplants are avoided.
|Item Type:||Journal Article|
|Subjects:||Q Science > QC Physics|
|Journal or Publication Title:||JOURNAL OF PHYSICS D-APPLIED PHYSICS|
|Publisher:||IOP PUBLISHING LTD|
|Date:||7 June 1998|
|Number of Pages:||6|
|Page Range:||pp. 1362-1367|
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