Precessional magnetization switching by a surface acoustic wave

Thevenard, L.; Camara, I. S.; Majrab, Silbé; Bernard, M.; Rovillain, Pauline; Lemaı̂tre, A.; Gourdon, C.; Duquesne, Jean-Yves

doi:10.1103/physrevb.93.134430

Cited by 81 publications

(76 citation statements)

References 38 publications

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“…Rayleigh waves are particularly well suited to the magnetoelasticity of (Ga,Mn)(As,P), since their strain components directly couple to the uniaxial out-of-plane anisotropy. SAW-induced precessional switching was, for instance, recently demonstrated [14], under fields of a few tens of mT applied perpendicular to the easy axis. In this work, we focus on the geometry where the field is along the easy axis, and use Kerr microscopy to monitor modifications to the coercive field and the shape of nucleated domains in the presence of a SAW.…”

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confidence: 90%

Strong reduction of the coercivity by a surface acoustic wave in an out-of-plane magnetized epilayer

et al. 2016

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Strong reduction of the coercivity by a surface acoustic wave in an out-of-plane magnetized epilayer

et al. 2016

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“…Similarly parameter S 21 , which corresponds to excitation at port 1 and measurement at port 2 is can be found from equations (S1) and (S4) as (S 21…”

Section: Fig S7 the Device Schematic Used To Show The Reciprocity Bementioning

confidence: 99%

“…(b)and (c) S 12 and S21 parameters of device 2 measured as a function of magnetic field. (e) and (f) panels show S 12 and S 21 for device 3 shown in panel d. The S-parameters satisfy the relation S 12 (B)=S21 (-B). All measurements were carried out at 5 GHz with 10 dBm power with magnetic field applied along 45 o angle.…”

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confidence: 97%

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Direct observation of the reciprocity between spin current and phonon interconversion

Bhuktare

Shukla

Singh

et al. 2019

Applied Physics Letters

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Spin current has emerged as a leading candidate for manipulation of spins in a nanomagnet. We here experimentally show another utility of spin current viz. it can be used for generation of phonons. Within the same experimental setup, we also demonstrate the inverse effect of generation of spin current by phonons. To demonstrate them, we measured the scattering-matrix of a two-port device with interdigital transducers as one port and array of Ni/Pt lines as second port on piezoelectric substrate. The off-diagonal elements which correspond to transmission between the ports, were found to have 180 o relative phase shift. The transmission of electrical signal from port 2 to 1 corresponds to generation of phonons from spin-current, while transmission from port 1 to 2 corresponds to the inverse effect. These results could be useful for designing spin-current based gyrators.Spintronics exploits the spin degree of freedom of an electron for various new functionalities [1]. The coupling of spins to heat currents (spin caloritronics) [2-9] orbital momentum (spin orbitronics) [10][11][12][13] or the mechanical degrees of freedom (spin mechanics) [14][15][16][17][18][19][20][21][22] has generated a lot of interest due to the novel physics involved and potential new applications of spin current. This coupling has enabled observation of various new phenomena such as spin Seebeck effect [3][4][5][6], acoustically driven resonance [15][16][17] etc. Spin seebeck effect refers to the generation of spin current over a macroscopic scale by temperature gradient, whereas in acoustically driven resonance, mechanical motion is used to excite spin dynamics. We here demonstrate that spin current can be used to excite phonons, which can travel macroscopic distances of the order of millimeter. Our experiment utilizes a piezoelectric LiNbO 3 substrate over which we fabricate a periodic array of Ni/Pt lines. We observed that when current is passed through Ni/Pt lines, phonons in the form of surface acoustic waves (SAW) are emitted, which can be detected by using interdigital transducers (IDT). This phonon emission involves many spin based phenomena: i) Conversion of charge current into spin current by spin-Hall effect (SHE) in Pt ii) Excitation of magnons in Ni by spin current via spin-transfer torque (STT) effect iii) emission of phonons by magnons via magneto-elastic coupling. Our setup also allows us to measure the inverse effect i.e. generation of spin current by phonons [19]. The inverse effect proceeds via inverse of the above three steps: i) generation of magnons by phonons via inverse magneto-elastic coupling ii) injection of spin current in Pt via. inverse STT effect or spin pumping iii) Conversion of spin current into charge current by inverse spin-Hall effect (ISHE) in Pt.Our experiments show that the transmission of electrical signal from IDTs to Ni/Pt lines (S 21 ) and transmission from Ni/Pt lines to IDTs (S 12 ) have opposite sign i.e. S 12 =-S 21 i.e. the Corresponding Author* Email: ashwin@ee.iitb.ac.in Author ContributionsTh...

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“…[2][3][4][5] In more academic environments, they are used in magnetism, in microfluidics and in quantum systems. In magnetism, SAWs can assist magnetization switching in ferromagnetic magnetostrictive thin films and nanostructures [6][7][8][9][10] for magnetic data storage application. The efficiency of that switching is related to the amplitude of the SAW.…”

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Vector network analyzer measurement of the amplitude of an electrically excited surface acoustic wave and validation by X-ray diffraction

Camara

Croset

Largeau

et al. 2017

Journal of Applied Physics

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Vector network analyzer measurement of the amplitude of an electrically excited surface acoustic wave and validation by X-ray diffraction Surface acoustic waves are used in magnetism to initiate magnetization switching, in microfluidics to control fluids and particles in lab-on-a-chip devices, and in quantum systems like two-dimensional electron gases, quantum dots, photonic cavities, and single carrier transport systems. For all these applications, an easy tool is highly needed to measure precisely the acoustic wave amplitude in order to understand the underlying physics and/or to optimize the device used to generate the acoustic waves. We present here a method to determine experimentally the amplitude of surface acoustic waves propagating on Gallium Arsenide generated by an interdigitated transducer. It relies on Vector Network Analyzer measurements of S parameters and modeling using the Coupling-Of-Modes theory. The displacements obtained are in excellent agreement with those measured by a very different method based on X-ray diffraction measurements. Published by AIP Publishing.

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Precessional magnetization switching by a surface acoustic wave

Cited by 81 publications

References 38 publications

Strong reduction of the coercivity by a surface acoustic wave in an out-of-plane magnetized epilayer

Strong reduction of the coercivity by a surface acoustic wave in an out-of-plane magnetized epilayer

Direct observation of the reciprocity between spin current and phonon interconversion

Vector network analyzer measurement of the amplitude of an electrically excited surface acoustic wave and validation by X-ray diffraction

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