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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
2. Brest State Technical University, Brest 224017, Belarus
3. Belarusian State Agrarian Technical University (BATU), Minsk 220023, Belarus
4. Institute of Radio Engineering and Electronics RAS (IRE RAS), Mokhovaya, 11, Moscow 125009, Russian Federation

Abstract
Spread of surface acoustic waves (SAW) of Rayleigh and SH-modes is examined on the surface medium of (100) and (110) orientations of the cubic crystal (Si, AsGa, etc.) covered with thin (much thinner than SAW wavelength) film of Heysler ferromagnetic alloy (HFA) with shape memory (SM). A 2-partial Rayleigh SAW spreads on the clear (100) cut of a crystal in a sagittal section and a volumetric transverse wave, a SH-mode, also does. A generalized 3-partial Rayleigh SAW spreads on a (110) cut at arbitrary wave vector k orientation, and only at k || [110] and k || [111] there are spoken above SAW.

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 || [110] 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.

 

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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