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

Thevenard, L.; Camara, I. S.; Prieur, J.-Y.; Rovillain, Pauline; Lemaı̂tre, A.; Gourdon, C.; Duquesne, Jean-Yves

doi:10.1103/physrevb.93.140405

Cited by 40 publications

(42 citation statements)

References 34 publications

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“…Let us underline that the likeliness between switched patterns starting from +M 0 or −M 0 also rules out that switching is due to a spurious static field along the easy axis, where domain nucleation could be favored by the SAW: it would then only be efficient starting from one configuration. Contrary to what we believe to be a resonant switching route here, this would be a non-resonant SAW-assisted mechanism, which has already been evidenced in (Ga,Mn)(As,P), Co/Pt and FeGa [10,11,13].…”

Section: Zero-field Saw-driven Switchingcontrasting

confidence: 82%

“…For the latter two however [2][3][4][5][6][7], the necessity for biasing fields remains ubiquitous, whether spin-transfer, spin-orbit torques, or electric-field modulations of the anisotropy are at play. A recently developed alternative for magnetization switching is the use of acoustic waves [8][9][10][11][12][13][14][15]. The effective field generated by Rayleigh waves through inverse magnetostriction can switch magnetization efficiently in magnetostrictive thin films of both in-plane and out-of-plane anisotropies [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Field-Free Magnetization Switching by an Acoustic Wave

et al. 2019

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Surface acoustic waves (SAW) propagating on magneto-strictive ferromagnets can induce magnetization reversal: their weak damping and mature technology make them ideal for remote wave control of magnetic bits. Experimental demonstrations of this spectacular coupling have so far required the simultaneous application of a static magnetic field. We show here SAW-driven allacoustical switching (AAS) over millimetric distances. It relies on the triggering of magnetization precession of a uniaxial in-plane magnetized film by acoustic ferromagnetic resonance at zero field. Moreover, the absence of biasing field enables toggling between the two equilibrium magnetic states for over twenty consecutive acoustic pulses. This proof-of-concept opens an alternative path to magnetic bit manipulation.

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Section: Zero-field Saw-driven Switchingcontrasting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Field-Free Magnetization Switching by an Acoustic Wave

et al. 2019

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“…For some applications, an increase of the amplitude by a factor of 1.24 can produce non-negligible effects. For example, it has been reported recently 10 that for the magnetostrictive and ferromagnetic material (Ga,Mn)(As,P), an increase of the surface acoustic wave strain ij ¼ 0:5 Á ðdu i =dj þ du j =diÞ (the strain is proportional to the amplitude) by a factor of 1.2 can reduce the coercive field to about 1 mT.…”

Section: Surface Acoustic Wave Amplitudementioning

confidence: 99%

“…[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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confidence: 99%

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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“…Among these applications are the acoustic manipulation and readout of magnetic memory elements [1][2][3][4] , acoustic driving of magnetic domain walls 5 , the acoustic generation of resonant spin-wave excitations [6][7][8][9][10][11][12][13][14] , and magnetic field detectors. 15, 16 Some of the interest rests on the point that acoustical wavelengths range in the sub-micron to micron scale at the gigahertz frequencies typical of spin-wave resonance.…”

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confidence: 99%

Mechanical back-action of a spin-wave resonance in a magnetoelastic thin film on a surface acoustic wave

2016

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Surface acoustic waves (SAWs) traveling on the surface of a piezoelectric crystal can, through the magnetoelastic interaction, excite traveling spin-wave resonance in a magnetic film deposited on the substrate. This spin-wave resonance in the magnetic film creates a time dynamic surface stress of magnetoelastic origin that acts back on the surface of the piezoelectric and modifies the SAW propagation. Unlike previous analyses that treat the excitation as a magnon-phonon polariton, here the magnetoelastic film is treated as a perturbation modifying boundary conditions on the SAW. We use acoustical perturbation theory to find closed form expressions for the back-action surface stress and strain fields and the resultant SAW velocity shifts and attenuation. We demonstrate that the shear stress fields associated with this spin-wave back-action also generate effective surface currents on the piezoelectric both in-phase and out-ofphase with the driving SAW potential. Characterization of these surface currents and their applications in determination of the magnetoelastic coupling are discussed. The perturbative calculation is carried out explicitly to first order (a regime corresponding to many experimental situations of current interest) and we provide a sketch of the implications of the theory at higher order.

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

Cited by 40 publications

References 34 publications

Field-Free Magnetization Switching by an Acoustic Wave

Field-Free Magnetization Switching by an Acoustic Wave

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

Mechanical back-action of a spin-wave resonance in a magnetoelastic thin film on a surface acoustic wave

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