Magneto-Acoustic Waves in Magnetic Thin Films

 

Details

Presenter:	Mathias Weiler
Title:	Magneto-Acoustic Waves in Magnetic Thin Films
Affiliation:	TU Kaiserslautern
Date:	09.03.2023
Time:	17:00 h
Place:	online

 

Contents of the Talk

Spin waves and acoustic waves are fundamental quasiparticles in magnetically ordered media. Both types of waves can become chiral at interfaces or surfaces, and they share similar sub-µm wavelengths for excitations in the GHz frequency range. Surface acoustic waves (SAW) are widely employed as frequency filters in mobile communication technology and as sensors and actuators in biomedical applications. Spin waves have great potential for data processing and communication applications [1] and magnetic-field sensing. The field of magnetoacoustics studies the interaction of spin waves and SAWs motivated by its potential for novel applications that exploit the desirable properties of both types of waves.

I will introduce the fundamental concepts of chiral magnetoacoustics [2] and then discuss the properties of magnetoacoustic waves in magnetically ordered thin films and heterostructures [3-7]. We experimentally study CMOS-compatible [6] devices that allow us to tailor the symmetry of the magnetoacoustic interaction [5]. We explore the properties of magnetoacoustic waves by microwave and optical techniques, in the linear and non-linear [8] interaction regimes. By tailoring the magnetic thin film heterostructures [4,7], magnetoacoustic waves can become highly non-reciprocal. Magnetoacoustic waves may be exploited as magnetic sensors or miniaturized microwave isolators.

[1] A. V. Chumak et al., IEEE Transactions on Magnetics 58, 0800172 (2022). [2] M. Küß et al., Frontiers in Physics 10, 981257 (2022). [3] M. Küß et al., Phys. Rev. Lett., 125, 217203 (2020). [4] M. Küß et al., Phys. Rev. Applied, 15, 034060 (2021). [5] M. Küß et al., Phys. Rev. Applied, 15, 034046 (2021). [6] I. Zdru et al., IEEE Electron Device Lett. 43, 1551 (2022). [7] M. Küß et al., Phys. Rev. B 107, 024424 (2023). [8] M. Geilen et al., arXiv:2201.04033 (2022). .

 

Short CV

Mathias Weiler was member of the Gross group at WMI as a master and Ph.D. student, as well as a postdoctoral researcher between 2007 and 2020. From December 2012 to November 2014 he was postdoctoral researcher at National Institute of Standards and Technology, Boulder, Colorado, supported by a DAAD stipend.

He is a full Professor (W3) at the Department of Physics of the University of Kaiserslautern and the State Research Center OPTIMAS. There he studies magnetic phenomena, aiming at novel applications. He is particularly interested in the dynamics of exchange-coupled spin systems in solids.