Ferromagnetic resonance in thin films submitted to multiaxial stress state: application of the uniaxial equivalent stress concept and experimental validation

Gueye, Mouhamadou; Zighem, F.; Belmeguenai, M.; Gabor, M. S.; Tiuşan, C.; Faurie, D.

doi:10.1088/0022-3727/49/26/265001

Cited by 19 publications

(23 citation statements)

References 35 publications

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“…One Kpt//film sample from each batch was characterised with an FMR-under-stress setup. 21,22 To enable this, the sample was glued to a piezoelectric actuator and a dc voltage was applied to the actuator to strain the sample. The second film of each batch was used to take measurements of the FMR response first in the presence of pure nitrogen gas (N 2 ) and then in the presence of pure hydrogen gas.…”

Section: Methodsmentioning

confidence: 99%

Ferromagnetic resonance investigation of physical origins of modification of the perpendicular magnetic anisotropy in Pd/Co layered films in the presence of hydrogen gas

Lueng

Zighem

Faurie

et al. 2017

Journal of Applied Physics

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In our work, we study the physical origins of the hydrogen gas induced reduction of the strength of perpendicular magnetic anisotropy (PMA) at the interface of cobalt and palladium layers. To this end, we grow these films on flexible substrates and carry out ferromagnetic resonance (FMR) measurements in the presence of two different stimuli-hydrogen gas and elastic strain. Exposing the samples to H 2 results in a downshift of the FMR field. On the contrary, FMR measurements carried out in the presence of an externally applied predominantly tensile elastic stress show an upshift in the resonance field consistent with negative values of the saturation magnetostriction coefficient for our samples. Qualitative analysis of these results demonstrates that the magneto-elastic contribution to the hydrogen-induced change in PMA is very small and is of the opposite sign to the electronic contribution related to the influence of hydrogen ions on the hybridisation of cobalt and palladium orbitals at the interface.

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Section: Methodsmentioning

confidence: 99%

Ferromagnetic resonance investigation of physical origins of modification of the perpendicular magnetic anisotropy in Pd/Co layered films in the presence of hydrogen gas

Lueng

Zighem

Faurie

et al. 2017

Journal of Applied Physics

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“…Finally, the relation between strains and voltage is given by data on Figure b. In these conditions, the resonance field for a magnetic field applied along x ‐axis is given by

\begin{array}{c} center & H_{normalr normale normals} = \sqrt{{true(2 π M_{normalS} + \frac{3 λ}{M_{normalS}} σ_{y y} true)}^{2} + {true(\frac{2 π f}{γ} true)}^{2}} \\ center & - 2 π M_{s} - \frac{3 λ}{M_{s}} (2 σ_{normalx normalx} - σ_{normaly normaly}) \end{array}

where γ is the gyromagnetic factor. We have carried out standardized FMR measurements in absence of applied voltage (not shown here) on the “Continuous Film” system to determine M S = 950 emu cm −3 and γ = 1.822 × 10 7 Hz Oe −1 values.…”

Section: Strains Transmission Factors αXx and αYy For The Different Smentioning

confidence: 99%

“…Finally, the relation between strains and voltage is given by data on Figure 1b. In these conditions, the resonance field for a magnetic field applied along x-axis is given by [34] H res ¼ ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi…”

mentioning

confidence: 99%

Local Stiffness Effect on Ferromagnetic Response of Nanostructure Arrays in Stretchable Systems

Challab

Zighem

Faurie

et al. 2018

Physica Rapid Research Ltrs

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The control of magnetoelastic effects in magnetic media, their improvement or even their minimization according to the intended applications is a current problem. In this work, the effect of the elastic strain on the magnetic properties of Ni60Fe40 continuous films and nanowires deposited on Kapton® substrates has been investigated. For this purpose, piezoactuation mechanical tests are performed in situ with ferromagnetic resonance measurements. It has been observed that the continuous thin film and the array of nanowires exhibit distinct behaviors in the presence of an elastic strain field. Precisely, the induced magnetoelastic anisotropy is much less pronounced in the case of nanowires. This difference in behavior has been explained/investigated based on finite element simulations. These latter revealed that the average strain transmitted from flexible substrate to magnetic medium is less important in the case of nanowires compared to continuous film. This lack of strain transfer/transmission is related to the relative amount of free surface of the nanostructures combined with a strong mechanical contrast between Ni60Fe40 and Kapton (viz., a deposit relatively much more stiffer than the substrate). This important effect can be exploited in the future by controlling and optimizing geometries of nanostructures.

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“…The third and fourth terms represent the OOP uniaxial anisotropy energy characterized by a constant K u and the magnetocrystalline anisotropy energies F MAE characterized by constants K i ( i = 1,2,3…), respectively. The last term is the magnetoelastic energy, which is discussed by the orthogonal normal stresses model(see more details in the Supporting Information). In this study, the T‐LFO films are fully relaxed so that the F MAE can be ignored.…”

mentioning

confidence: 99%

A Strategy to Modulate the Bending Coupled Microwave Magnetism in Nanoscale Epitaxial Lithium Ferrite for Flexible Spintronic Devices

Shen

Lan

et al. 2018

Advanced Science

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With the development of flexible electronics, the mechanical flexibility of functional materials is becoming one of the most important factors that needs to be considered in materials selection. Recently, flexible epitaxial nanoscale magnetic materials have attracted increasing attention for flexible spintronics. However, the knowledge of the bending coupled dynamic magnetic properties is poor when integrating the materials in flexible devices, which calls for further quantitative analysis. Herein, a series of epitaxial LiFe5O8 (LFO) nanostructures are produced as research models, whose dynamic magnetic properties are characterized by ferromagnetic resonance (FMR) measurements. LFO films with different crystalline orientations are discussed to determine the influence from magnetocrystalline anisotropy. Moreover, LFO nanopillar arrays are grown on flexible substrates to reveal the contribution from the nanoscale morphology. It reveals that the bending tunability of the FMR spectra highly depends on the demagnetization field energy of the sample, which is decided by the magnetism and the shape factor in the nanostructure. Following this result, LFO film with high bending tunability of microwave magnetic properties, and LFO nanopillar arrays with stable properties under bending are obtained. This work shows guiding significances for the design of future flexible tunable/stable microwave magnetic devices.

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Ferromagnetic resonance in thin films submitted to multiaxial stress state: application of the uniaxial equivalent stress concept and experimental validation

Cited by 19 publications

References 35 publications

Ferromagnetic resonance investigation of physical origins of modification of the perpendicular magnetic anisotropy in Pd/Co layered films in the presence of hydrogen gas

Ferromagnetic resonance investigation of physical origins of modification of the perpendicular magnetic anisotropy in Pd/Co layered films in the presence of hydrogen gas

Local Stiffness Effect on Ferromagnetic Response of Nanostructure Arrays in Stretchable Systems

A Strategy to Modulate the Bending Coupled Microwave Magnetism in Nanoscale Epitaxial Lithium Ferrite for Flexible Spintronic Devices

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