Observation of microwave-assisted magnetization reversal in Fe65Co35 thin films through ferromagnetic resonance measurements

Nistor, Corneliu; Sun, Kening; Wang, Zihui; Wu, Mingzhong; Mathieu, C.; Hadley, Matthew

doi:10.1063/1.3175721

Cited by 35 publications

(22 citation statements)

References 11 publications

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“…4b, the sharp transition in the transverse resistance curve is associated with magnetization reversal due to the change of the field from H ex þ H an to H ex À H an (ref. 40). The SOT-induced magnetization reversal is suppressed here as the damping of Ni 80 Fe 20 is 40.05 due to the spin-pumping effect 41 .…”

Section: Resultsmentioning

confidence: 95%

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Observation of the nonlocal spin-orbital effective field

et al. 2013

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The spin-orbital interaction in heavy nonmagnetic metal/ferromagnetic metal bilayer systems has attracted great attention and exhibited promising potentials in magnetic logic devices, where the magnetization direction is controlled by passing an electric current. It is found that the spin-orbital interaction induces both an effective field and torque on the magnetization, which have been attributed to two different origins: the Rashba effect and the spin Hall effect. It requires quantitative analysis to distinguish the two mechanisms. Here we show sensitive spin-orbital effective field measurements up to 10 nm thick ferromagnetic layer and find the effective field rapidly diminishes with the increase of the ferromagnetic layer thickness. We further show that this effective field persists even with the insertion of a copper spacer. The nonlocal measurement suggests that the spin-orbital effective field does not rely on the heavy normal metal/ferromagnetic metal interface.

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Section: Resultsmentioning

confidence: 95%

“…As an independent check, we have also carried out the ST-FMR experiments on Co 40 Fe 40 B 20 /Ta sample. Both the SOT and the current induced field can be extracted from the symmetric and antisymmetric rectified voltage spectra, respectively.…”

Section: Discussionmentioning

confidence: 99%

Observation of the nonlocal spin-orbital effective field

et al. 2013

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“…[2][3][4][5][6][7][8][9][10][11] Microwave-assisted magnetization reversal (MAMR) has been widely investigated for application to perpendicular magnetic writing in hard disk drives. [12][13][14][15][16] Very recently, a frequency-dependent reduction in the switching field of the magnetization was experimentally reported for CoCrPt-SiO 2 granular films with perpendicular anisotropy.…”

Section: Introductionmentioning

confidence: 99%

Frequency dependence of critical switching asteroid of CoCrPt–SiO2 granular film under 50-ns microwave impulse

Ishida¹,

Soeno²,

Sekiguchi³

et al. 2013

Journal of Applied Physics

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Understanding the dynamic process of microwave-assisted magnetization reversal (MAMR) in a dipole–dipole coupled granular perpendicular medium is essential for its application to future magnetic storage devices. We experimentally investigated the magnetization reversal process in CoCrPt–SiO2 granular films in terms of the dependence of the switching field on the strength of an applied in-plane radio-frequency magnetic field. The reversal process changed from non-uniform rotation to uniform rotation when the frequency increased toward the ferromagnetic resonance frequency. In the resonant condition, the switching field agreed well with a model assuming uniform rotation of the magnetization in each grain. The agreement suggests that the decoherence of ferromagnetic resonance due to a dynamic dipolar field is weak in adequately exchange-coupled granular films with a saturation magnetization of 415 emu/cm3. This finding is significant for the development of the practical medium necessary for MAMR writing.

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“…Considering ref. 70 we fitted a linear function μ 0 Δ H = μ 0 Δ H 0 + 4 πα intr f r / γ to the given data in Fig. 3f, where γ is the gyromagnetic ratio.…”

Section: Resultsmentioning

confidence: 99%

Room-temperature helimagnetism in FeGe thin films

Zhang

Stasinopoulos

Lancaster

et al. 2017

Sci Rep

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Chiral magnets are promising materials for the realisation of high-density and low-power spintronic memory devices. For these future applications, a key requirement is the synthesis of appropriate materials in the form of thin films ordering well above room temperature. Driven by the Dzyaloshinskii-Moriya interaction, the cubic compound FeGe exhibits helimagnetism with a relatively high transition temperature of 278 K in bulk crystals. We demonstrate that this temperature can be enhanced significantly in thin films. Using x-ray scattering and ferromagnetic resonance techniques, we provide unambiguous experimental evidence for long-wavelength helimagnetic order at room temperature and magnetic properties similar to the bulk material. We obtain α intr = 0.0036 ± 0.0003 at 310 K for the intrinsic damping parameter. We probe the dynamics of the system by means of muon-spin rotation, indicating that the ground state is reached via a freezing out of slow dynamics. Our work paves the way towards the fabrication of thin films of chiral magnets that host certain spin whirls, so-called skyrmions, at room temperature and potentially offer integrability into modern electronics.

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Observation of microwave-assisted magnetization reversal in Fe65Co35 thin films through ferromagnetic resonance measurements

Cited by 35 publications

References 11 publications

Observation of the nonlocal spin-orbital effective field

Observation of the nonlocal spin-orbital effective field

Frequency dependence of critical switching asteroid of CoCrPt–SiO2 granular film under 50-ns microwave impulse

Room-temperature helimagnetism in FeGe thin films

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