SAW-Induced Spin Wave Excitation in Ferromagnetic Epitaxial Thin Films

Studying the collective excitations of the spin structure (magnons) in highly ordered materials like epitaxial thin films is an interresting field and offers an insight in the magnertic properties of new materials.Surface Acoustic Waves (SAW) have recently been used to study the phonon-magnon-coupling in for example thin films of Nickel evaporated on piezoelectric substrate material like LiNbO3.More interesting material classes, e.g. valence transition compounds, are usually grown on specially selected substrates to get highly ordered, epitaxial thin films with a specific lattice constant to achieve fine-tuned biaxial tensions which affect the magnetic properties.These substrates are usually non-piezoelectric and the phonon-magnon coupling can't be studied easily. Here we show a procedure that can be used to apply the well established SAW-based methods for the investigation of magnon spectra of epitaxial thin films grown on non-piezoelectric substrates.Using reactive RF sputtering methods, piezoelecxtric thin films can be applied on various non-piezoelectric substrates for the excitation of SAW in these substrates.A carefully coordinated sequence of reactive RF-sputtering, patterning and etching ensures best possible preservation of sensitive thin films.Measurments on well known Nickel thin films are shown as a reference.Further data of more exotic valence transition compounds measured at low temperatures are presented.The presented technique can be adapted by typically equipped thin-film laboratories without further costly investments and thus allows highly-sensitive measurements of the magnon spectrum of thin-film materials in the range of up to ~3 GHz (depending on the quality of available lithography equipment).

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Title: ScienceOpen Posters

Publisher: ScienceOpen

Publication date (Electronic preprint): 11 December 2023

Affiliations

[1 ] Institute of Physics, Goethe-University, Frankfurt am Main, Germany ( https://ror.org/04cvxnb49)

[2 ] Department of Physics, University of Siegen, Germany ( https://ror.org/02azyry73)

Author notes

[* ]Email: schuck@ 123456physik.uni-frankfurt.de .

Author information

Alfons Georg Schuck https://orcid.org/0000-0001-5199-2415

Sebastian Kölsch https://orcid.org/0000-0003-3596-964X

Michael Huth https://orcid.org/0000-0001-7415-465X

Article

DOI: 10.14293/P2199-8442.1.SOP-.P2VKHX.v1

SO-VID: 5669acf5-5aed-45b5-a30e-c2a375de93af

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This work has been published open access under Creative Commons Attribution License CC BY 4.0 , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Conditions, terms of use and publishing policy can be found at www.scienceopen.com .

History

Date received : 11 December 2023

Funding

Funded by: funder-id http://dx.doi.org/10.13039/501100001659, Deutsche Forschungsgemeinschaft;

Award ID: 422213477

References

Weiler M., Dreher L., Heeg C., Huebl H., Gross R., Brandt M. S., Goennenwein S. T. B.. Elastically Driven Ferromagnetic Resonance in Nickel Thin Films. Physical Review Letters. Vol. 106(11)2011. American Physical Society (APS). [Cross Ref]
Küß M., Porrati F., Hörner A., Weiler M., Albrecht M., Huth M., Wixforth A.. Forward volume magnetoacoustic spin wave excitation with micron-scale spatial resolution. APL Materials. Vol. 10(8)2022. AIP Publishing. [Cross Ref]
Iqbal Abid, Mohd-Yasin Faisal. Reactive Sputtering of Aluminum Nitride (002) Thin Films for Piezoelectric Applications: A Review. Sensors. Vol. 18(6)2018. MDPI AG. [Cross Ref]

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[1] Weiler M., Dreher L., Heeg C., Huebl H., Gross R., Brandt M. S., Goennenwein S. T. B.. Elastically Driven Ferromagnetic Resonance in Nickel Thin Films. Physical Review Letters. Vol. 106(11)2011. American Physical Society (APS). [Cross Ref]

[2] Küß M., Porrati F., Hörner A., Weiler M., Albrecht M., Huth M., Wixforth A.. Forward volume magnetoacoustic spin wave excitation with micron-scale spatial resolution. APL Materials. Vol. 10(8)2022. AIP Publishing. [Cross Ref]

[3] Iqbal Abid, Mohd-Yasin Faisal. Reactive Sputtering of Aluminum Nitride (002) Thin Films for Piezoelectric Applications: A Review. Sensors. Vol. 18(6)2018. MDPI AG. [Cross Ref]