The Influence of a Heysler Ferromagnetic Alloy Film on the Spread of Surface Acoustic Waves
|Michael M. Karpuk 1, Dmitriy A. Kostiuk 2, Yuri A. Kuzavko 3, Vladimir G. Shavrov 4|
1. Technical University of Koszalin, Raclawicka 15-17, Koszalin, Poland
Film coating with HFA with SM wasn't previously examined from the point of view of SAW spread. Let us note that longitudinal wave (LA) speeds in volumetric Ni2MnGa HFA are vl=5540 m/s, fast transverse (TA1) v1t=3560 m/s and slow one (TA2) v2t=740 m/s at spread along the k ||  axis with e || [1T0] polarization. Measured speed changes at Ni2MnGa PT are about Δvl≅1.5%, Δv1t≅8%, and Δv2t≅40% respectfully and under external magnetic field at HFA saturation they are Δvl≅0.2%, Δv1t≅0.3% and Δv2t≅1%. We have measured 6% vl change in polycrystalline Ni2.14Mn0.81Fe0.05Ga sample (TMA=40oC) at change from paramagnetic phase to a low-temperature martensitic one. Ni53Mn25Ga22 of 3.83x4.06x9.93 mm3 with combined magnetostructural PT (TMA=105oC) also had 6% at such PT. At HFA film thickness of 0.01 wavelengths there is maximum sensitivity of 0.001o temperature, 1 Oe magnetic field and 1 Pa pressure measurements at 1 Hz stability of the device operation.
Presentation: Oral at E-MRS Fall Meeting 2009, Symposium F, by Yuri A. Kuzavko
See On-line Journal of E-MRS Fall Meeting 2009
Submitted: 2009-05-11 09:05 Revised: 2009-06-30 21:01
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