Laser-generated gigahertz surface acoustic waves with tunable amplitude during the magnetostructural phase transition in Fe-Rh thin films

Mogunov, Ia. A. (avtor), Klokov, A. Yu. (avtor), Frolov, N. Yu. (avtor), Protasov, Andrey (avtor), Zhezlyaev, Gleb (avtor), Devyaterikov, Denis (avtor), Gimaev, Radel (avtor), Zverev, Vladimir I. (avtor), Kalashnikova, A.M. (avtor)

Laser-generated surface acoustic waves (SAWs) facilitate efficient information processing in modern spintronics and magnonics. The ability to tune the SAW parameters such as the amplitude is crucial to achieve acoustic control over magnonic properties. Such tunability can be achieved in phase-changing magnetic materials that accommodate both spin waves and SAWs. A promising material is the Fe-Rh alloy, a metallic antiferromagnet at room temperature that undergoes a phase transition to the ferromagnetic state accompanied by a crystal lattice expansion at 370 K. This transition can also be induced by femtosecond laser pulses. In this paper, we use the phase transition in a 60-nm Fe▫$_{49}$▫Rh▫$_{51}$▫ film to optically generate pulses of Gigahertz quasi-Rayleigh SAWs. We detect them via the photoelastic effect and show that the lattice transformation during the phase transition is a dominant strain-generation mechanism for above-threshold excitation. The weight of this contribution rises as the sample is heated closer to the antiferromagnetic-ferromagnetic transition temperature and “switches off” when heated above it, allowing for control of the SAW amplitude. A model based on thermodynamic parameters of Fe▫$_{49}$▫Rh▫$_{51}$▫ shows that the lattice transformation occurring within 95 ps effectively contributes to SAW generation happening on a comparable timescale, while nonequilibrium fast kinetics of the phase transition does not.

• Jezik: Angleški jezik
• Ključne besede: Fe-Rh thin films, magnetostructural phase transition, surface acoustic waves, spintronics, magnonics
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Leto izida: 2026
• Št. strani: 12 str.
• Številčenje: Vol. 25, art. 054062
• PID: 20.500.12556/RUL-185679
• UDK: 537.622:621.318.1
• ISSN pri članku: 2331-7019
• DOI: 10.1103/fgq4-ff7g
• COBISS.SI-ID: 287779075
• Datum objave v RUL: 17.08.2026

Gradivo je del revije

• Naslov: Physical review applied
• Skrajšan naslov: Phys. rev. appl.
• Založnik: American Physical Society
• ISSN: 2331-7019
• COBISS.SI-ID: 525838617

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: Fe-Rh tanke plasti, magnetostrukturni fazni prehodi, površinski akustični valovi, spintronika, magnonika

Projekti

• Financer: Drugi - Drug financer ali več financerjev
• Številka projekta: 24-72-00111
• Naslov: Russian Science Foundation Grant