1. Surface acoustic waves control with external magnetic field in TbCo2/FeCo films
Vladimir Onoprienko,1, 2, 3 Ivan Lisenkov,1, 2, 3, Alexey Klimov,1, 2, 4 Sergey Nikitov,1, 2, 3, 5 Philippe Pernod,1, 6 Vladimir Preobrajenski1, 6, 7 1)International Associated Laboratory on Critical and Supercritical phenomena infunctional electronics 2)Kotelnikov Institute of Radio-engineering and Electronics of RAS 3)Moscow Institute of Physics and Technology 4)Moscow State Institute of Radio-engineering Electronics and Automation 5)Saratov State University 6)Institut d'Electronique, de Microelectronique et de Nanotechnologie, Ecole Centrale de Lille 7)Wave Research Center, A. M. Prokhorov General Physics Institute of RAS

2. Nonlinear Magneto-Acoustics of condensed matter
Elastic
Subsystem
Specificity of activity:
Innovative Applications:
Ultrasonic Systems
Micro-actuators &
Microsystems
Spin
Subsystem
NL coupling
2nd order
Phase Transition
SRT
Soft
Controlable
nonlinear
Innovative
Active Materials
Extra-ordinary &
Controlable Properties
Critical Dynamics

3. Magnetically controlled acoustic devices
Low frequency
High frequency

4. Ultrasonic delay line with magnetostrictive material

5. MOKE Study of TbCo/FeCo films
Polarized Laser Beam
Sensor for M
Measurements
LED +
Polarizer
Video Camera
+ Analyser
ElectroMagnet
Sample

6. FMR Study of TbCo/FeCo filmsRF
input H M
e.a.
0.63 mkm
cristal
detector
sample
DAQ
Kerr
photodetector
Half width

7. Roadmap of theoretical calculations
Dynamic magnetic susceptibility
Equilibrium state of magnetization
SAW phase velocity
Effective constitutive parameters

8. Equilibrium state of magnetization and effective magnetic field
Small pertubations:

9. Dynamic parameters
Equations of motion:

10. Magnetostrictive material
Boundary conditions
Magnetostrictive material
Lithium niobate
Ox3
if (ω0, k0 ) satisfy boundary conditions
V0 = ω0/k0 is SAW phase velocity of the structure

11. Phase velocity measurements

12. Experimental data Delay line parameters Frequency: 230 MHz
TbCo/FeCo length: 0.3mkm
TbCo/FeCo height: 250 nm
TbCo/FeCo parameters
FMR width: 75 Oe
B = -7 MPa
V(H=infinity) = 3226 m/s

13. Angle dependence

14. Conclusions
Dependence of SAW phase velocity in external magnetic field in TbCo2/FeCo films is experimentally measured
Effective dynamic parameters of magnetostrictive matreials were introduced by linearization of motion equations
SAW phase velocity was calculated using effective dynamic parameters
Magnetostrictive parameters of TbCo2/FeCo obtained experimentally