Interaction of acoustic waves with spin waves using a GHz operating GaN/Si SAW device with a Ni/NiFeSi layer between its IDTs

A two port surface acoustic wave (SAW) device was developed to be used for the control and excitation via spin waves (SW). The structure was manufactured using advanced nanolithography techniques, on GaN/Si, enabling fundamental Rayleigh interdigitated transducer (IDT) resonances in GHz frequency ra...

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Bibliographic Details
Published in:	IEEE transactions on ultrasonics, ferroelectrics, and frequency control Vol. PP; p. 1
Main Authors:	Zdru, Ioana, Ciubotaru, Florin, Nastase, Claudia, Florescu, Andrei, Hamadeh, Alexandre Abbass, Geilen, Moritz, Nicoloiu, Alexandra, Boldeiu, George, Vasilache, Dan, Iordanescu, Sergiu, Nedelcu, Life Monica, Narducci, Daniele, Ciornei, Mihaela-Cristina, Adelmann, Christoph, Dinescu, Adrian, Weiler, Mathias, Pirro, Philipp, Muller, Alexandru
Format:	Journal Article
Language:	English
Published:	United States IEEE 26-09-2024
Subjects:	Couplings Frequency control GaN GHz operating SAW device Magnetic field measurement magnetic field strength Magnetic fields Magnetoacoustic effects Magnetostriction magnetostrictive layer Nickel Silicon spin waves Surface acoustic wave devices Surface acoustic waves
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Summary:	A two port surface acoustic wave (SAW) device was developed to be used for the control and excitation via spin waves (SW). The structure was manufactured using advanced nanolithography techniques, on GaN/Si, enabling fundamental Rayleigh interdigitated transducer (IDT) resonances in GHz frequency range. The ferromagnetic resonance of the magnetostrictive Ni/NiFeSi layer placed between the IDTs of the SAW device can be tuned to the SAW resonance frequency by magnetic fields. Using structures with finger and interdigit spacing of 170 nm and 100 nm, fundamental Rayleigh IDT resonance frequencies of 6.4 and 10.4 GHz have been obtained. Coupling of SAW to SW was demonstrated through transmission measurements at the fundamental Rayleigh frequencies in a magnetic field, μ0H from -280 to +280 mT, at different angles (θ) between the SAW propagation direction and the magnetic field direction. For the 6.4 GHz resonator a maximum decrease of about 1.2 dB occurred in \|S21\|, at μ0H = 30 mT and at θ = 45. Time-gated processing of the frequency domain raw data was used to remove the direct electromagnetic cross talk and triple transit effects. Nonreciprocity associated to the coupling was analyzed for the two SAW structures. The quantitative influence of the magnetic field strength on the phase of the transmission parameters is also presented.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0885-3010 1525-8955 1525-8955
DOI:	10.1109/TUFFC.2024.3463731