Intrinsic versus shape anisotropy in micro-structured magnetostrictive thin films for magnetic surface acoustic wave sensors

Mishra, Harshad; Hehn, Michel; Lacour, Daniel; Elmazria, O.; Tiercelin, Nicolas; M'Jahed, Hamid; Dumesnil, K.; Petit-Watelot, Sébastien; Polewczyk, Vincent; Talbi, Abdelkrim; Matar, Olivier Bou; Hage-Ali, Sami

doi:10.1088/1361-665x/ab522d

Cited by 23 publications

(10 citation statements)

References 34 publications

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“…The qualitative resemblance of the simulated and experimental configurations is very good, showing a multidomain configuration. A very similar multidomain configuration has also been observed in microstrips of a different magnetostrictive material 20 . Figure 3d,e show snapshots at different fields during the magnetization process of the nanostrip, both with and without SAW (see also the animation in Supplementary Material).…”

supporting

confidence: 69%

Magnetization process of a ferromagnetic nanostrip under the influence of a surface acoustic wave

Castilla

Yanes

Sinusía

et al. 2020

Sci Rep

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Surface Acoustic Waves (SAW) are one of the possible solutions to target the challenges faced by modern spintronic devices. The stress carried by the SAW can decrease the current required to achieve magnetic switching or domain wall movement by spin transfer torque. Although the last decade has produced very relevant results in this field, it is still important to study the effects of a SAW on the basic unit of many spintronic devices, a ferromagnetic nanostrip. In this work, we perform a complete set of measurements and simulations to characterize the magnetization process of a Ni nanostrip under the influence of a SAW. We find that the SAW increases the mobility and the depinning ability of the magnetic domain walls and consequently, promotes a sharper approach to saturation and substantially decreases coercivity. We have also found other two interesting effects. When the SAW has sufficient energy, is able to trigger irreversible transitions even before switching the direction of the external magnetic field. Additionally, we have found that the magnetization process depends on the direction of the travelling SAW.

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supporting

confidence: 69%

Magnetization process of a ferromagnetic nanostrip under the influence of a surface acoustic wave

Castilla

Yanes

Sinusía

et al. 2020

Sci Rep

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“…8 illustrates the simulated relative frequency variations of the Rayleigh wave mode as a function of the applied magnetic field that is parallel to the hard axis, compared with the experimental data adapted from Ref. [24]. ΔE effect is the major sensitive effect in TbCo2/FeCo.…”

Section: ) (Tbco2/feco Multi-layer)/128°yx-cut Linbo3 Structurementioning

confidence: 99%

Sensing Mechanism of Surface Acoustic Wave Magnetic Field Sensors Based on Ferromagnetic Films

Yang

Mishra

Han

et al. 2021

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Surface acoustic wave (SAW) sensors with ferromagnetic materials are used to measure magnetic fields or electric currents. The magnetic field sensitivities of SAW magnetic field sensors are essentially influenced by various factors. The sensing mechanism is complex due to the multiphysics coupling of the magnetic field, solid mechanics, and electric field. The magnetostriction effect, ΔE effect, and the third-order material constants are taken into consideration. The shape demagnetizing effect is reduced by increasing the lengthwidth ratio and length-height ratio of a ferromagnetic film on a SAW resonator. The model is verified by experiments and accurately predicts the magnetic field sensitivities of SAW resonant magnetic field sensors. The factors affecting the sensitivities are investigated from the perspective of the sensing mechanism. A grooved sensing surface structure is explored for an improved sensitivity. The results are beneficial to design reliable SAW magnetic field sensors with an enhanced sensitivity.

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“…Typical substrates are St-cut Quartz in different cutting directions, LiNbO 3 and LiTaO 3 [2][3][4][5][6][7][8][9][10][11][12]. In that context, a wide range of ferromagnetic materials are used for the magnetic sensitive layer, e.g., FeCo, FeGa, Fe 2 Tb and (Fe 90 Co 10 ) 78 Si 12 B 10 (FeCoSiB) [10][11][12], which are deposited on the SAW sensor as full films, multilayers or patterned structures [12][13][14]. The variety of magnetic layers display different magnetic behavior, which is strongly correlated to the magnetic anisotropies of the magnetic films.…”

Section: Introductionmentioning

confidence: 99%

Sputter Deposited Magnetostrictive Layers for SAW Magnetic Field Sensors

Thormählen

Seidler

Schell

et al. 2021

Sensors

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For the best possible limit of detection of any thin film-based magnetic field sensor, the functional magnetic film properties are an essential parameter. For sensors based on magnetostrictive layers, the chemical composition, morphology and intrinsic stresses of the layer have to be controlled during film deposition to further control magnetic influences such as crystallographic effects, pinning effects and stress anisotropies. For the application in magnetic surface acoustic wave sensors, the magnetostrictive layers are deposited on rotated piezoelectric single crystal substrates. The thermomechanical properties of quartz can lead to undesirable layer stresses and associated magnetic anisotropies if the temperature increases during deposition. With this in mind, we compare amorphous, magnetostrictive FeCoSiB films prepared by RF and DC magnetron sputter deposition. The chemical, structural and magnetic properties determined by elastic recoil detection, X-ray diffraction, and magneto-optical magnetometry and magnetic domain analysis are correlated with the resulting surface acoustic wave sensor properties such as phase noise level and limit of detection. To confirm the material properties, SAW sensors with magnetostrictive layers deposited with RF and DC deposition have been prepared and characterized, showing comparable detection limits below 200 pT/Hz1/2 at 10 Hz. The main benefit of the DC deposition is achieving higher deposition rates while maintaining similar low substrate temperatures.

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Intrinsic versus shape anisotropy in micro-structured magnetostrictive thin films for magnetic surface acoustic wave sensors

Cited by 23 publications

References 34 publications

Magnetization process of a ferromagnetic nanostrip under the influence of a surface acoustic wave

Magnetization process of a ferromagnetic nanostrip under the influence of a surface acoustic wave

Sensing Mechanism of Surface Acoustic Wave Magnetic Field Sensors Based on Ferromagnetic Films

Sputter Deposited Magnetostrictive Layers for SAW Magnetic Field Sensors

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