Imaging of Love Waves and Their Interaction with Magnetic Domain Walls in Magnetoelectric Magnetic Field Sensors

Müller, Claus; Durdaut, Phillip; Holländer, Rasmus B.; Kittmann, Anne; Schell, Viktor; Meyners, Dirk; Höft, Michael; Quandt, Eckhard; McCord, Jeffrey

doi:10.1002/aelm.202200033

Cited by 10 publications

(10 citation statements)

References 65 publications

(96 reference statements)

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“…Moreover, the amplitude and phase of magnetoacoustic waves are characteristically modulated as a function of the external magnetic field. This was used to build low-noise magnetic field sensors [91][92][93]. For future acoustic magnetic field sensors, it should be additionally possible to determine the sign of the magnetic field if the transmission of the magnetoacoustic wave is nonreciprocal.…”

Section: Discussion Conclusion and Outlookmentioning

confidence: 99%

Chiral Magnetoacoustics

2022

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Nonreciprocal microwave devices are key components of communication platforms. Nonreciprocity can arise in chiral systems, where chirality refers to a fixed handedness that is preserved under time reversal. Chiral excitations (quasiparticles) provide opportunities for the realization of miniaturized microwave components with directional properties. In particular, surface acoustic waves that propagate in magnetic media are chiral and can display pronounced nonreciprocal character. Because surface acoustic waves are an established technological platform, hybrid surface acoustic wave/spin wave devices have great application potential. In this mini-review, we introduce the general concept of chiral and nonreciprocal magnetoacoustic waves. We discuss a widely employed phenomenological model based on magnetoelastic coupling and magneto-rotation that quantitatively accounts for many experimental findings and give a brief overview over selected experiments and advances in this emerging research field.

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Section: Discussion Conclusion and Outlookmentioning

confidence: 99%

Chiral Magnetoacoustics

2022

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“…The magnetoacoustic response at different frequencies, which lay within the wide transmission band of the TIDT, can be assigned to the spatially separated CoFe+Ga, CoFe, and CoFe+Pt magnetic micro-stripes. SAW-SW interaction with micron-scale spatial resolution can be interesting for future applications in magnonics and the realization of new types of microwave devices such as magnetoacoustic sensors 5,6,60 or microwave acoustic isolators 14,[19][20][21] . For instance, giant nonreciprocal SAW transmission was observed in magnetic bilayers and proposed to build re-configurable acoustic isolators 14,[19][20][21] .…”

Section: Discussionmentioning

confidence: 99%

Forward volume magnetoacoustic spin wave excitation with micron-scale spatial resolution

et al. 2022

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The interaction between surface acoustic waves (SAWs) and spin waves (SWs) in a piezoelectric-magnetic thin film heterostructure yields potential for the realization of novel microwave devices and applications in magnonics. In the present work, we characterize magnetoacoustic waves in three adjacent magnetic micro-stripes made from CoFe + Ga, CoFe, and CoFe + Pt with a single pair of tapered interdigital transducers (TIDTs). The magnetic micro-stripes were deposited by focused electron beam-induced deposition and focused ion beam-induced deposition direct-writing techniques. The transmission characteristics of the TIDTs are leveraged to selectively address the individual micro-stripes. Here, the external magnetic field is continuously rotated out of the plane of the magnetic thin film and the forward volume SW geometry is probed with the external magnetic field along the film normal. Our experimental findings are well explained by an extended phenomenological model based on a modified Landau–Lifshitz–Gilbert approach that considers SWs with nonzero wave vectors. Magnetoelastic excitation of forward volume SWs is possible because of the vertical shear strain ɛ xz of the Rayleigh-type SAW.

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“…The designed MPD is based on the cantilever-structured AlGaN/GaN high-electronmobility transistor (HEMT), in which a magnetic thin film ((Fe 90 Co 10 ) 78 Si 12 B 10 ) is deposited on the front end of the cantilever. [37][38][39][40] The enlarged part is the schematic cross-section of the AlGaN/GaN HEMT, where from top to bottom are AlGaN, AlN, GaN, and Si substrates. The thicknesses of AlGaN, AlN, and GaN layers are 30 nm, 1 nm, and 4.3 µm, respectively, and the active region of MPD is 34 × 34 µm 2 , as shown in Supplementary Table S1.…”

Section: The Design and Performance Of Mpdmentioning

confidence: 99%

Magnetosensory Power Devices Based on AlGaN/GaN Heterojunctions for Interactive Electronics

Zhou

Hua

Sha

et al. 2023

Adv Elect Materials

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The advances in biological magnetoreception and microelectronics have promoted the vigorous development of interactive electronic devices capable of noncontact interaction and control via magnetic fields. Here, a magnetosensory power device (MPD) that integrates a magnetic film ((Fe90Co10)78Si12B10) unit into a cantilever‐structured AlGaN/GaN‐based high‐electron‐mobility‐transistor is presented. The MPD is capable to not only sense external magnetic field, but also control device output power with the emulation of magnetoreception. Specifically, the device can achieve significant control of output power density (18.04 to 18.94 W mm−2) quasi‐linearly with magnetic field stimuli (0–400 mT) at a gate bias of −5 V. In addition, the maximum output power density of the MPD can reach 85.8 W mm−2 when a gate bias of 1 V is applied. The simulation and experimental results show that MPD has excellent orientation and magnetic field sensing functions under 0–400 mT magnetic fields. With the intelligent capabilities of magnetic sense and output power control, such interactive electronic devices will have broad application prospects in the fields of artificial intelligence, advanced robotics, and human‐machine interfaces.

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Imaging of Love Waves and Their Interaction with Magnetic Domain Walls in Magnetoelectric Magnetic Field Sensors

Cited by 10 publications

References 65 publications

Chiral Magnetoacoustics

Chiral Magnetoacoustics

Forward volume magnetoacoustic spin wave excitation with micron-scale spatial resolution

Magnetosensory Power Devices Based on AlGaN/GaN Heterojunctions for Interactive Electronics

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