Magnetization dynamics in permalloy films with stripe domains

Soh, Wee Tee; Phuoc, Nguyen N.; Tan, C. Y.; Ong, C. K.

doi:10.1063/1.4817767

Cited by 56 publications

(38 citation statements)

References 40 publications

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“…As the sample is a Py soft magnetic film can be magnetically saturated in a lower magnetic field. For Py film with 20 and 100 nm thickness, no stripe domain will be expected from our previous study . However, in films with thickness above 200 nm, a stripe domain is present.…”

Section: Methodsmentioning

confidence: 47%

“…However, as shown in Figure , the

V_{D C}^{S R E}

spectra of Py film with a thickness of 300 nm using sweeping magnetic field and sweeping frequency method have a different feature. The Py film of 300 nm thickness demonstrates a distinct stripe domain structure in magnetization hysteresis loops in the VSM measurement shown in Figure , which is saturated under the magnetic field higher than 80 Oe. The spectra of the frequency‐swept method display two peaks at low magnetic field.…”

Section: Resultsmentioning

confidence: 91%

“…By solving the LLG equation, the spectrum can be fitted by the Lorentz and dispersive shape components, and the Lorentz shape is symmetric while the dispersive shape is antisymmetric around the resonance field . However, this method is not suitable if the magnetic domain structure changes with the sweeping of magnetic field during the measurement process, such as in stripe domain structure, in which the magnetic domains will reorientate along the external magnetic field . In this work, we propose a new method such that the dc voltage spectrum is measured by sweeping frequency under a fixed bias field .…”

Section: Introductionmentioning

confidence: 99%

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Spin Rectification dc Voltage Spectra via Sweeping Frequency

Pan

Soh

Liu

et al. 2019

Physica Status Solidi (b)

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A new measurement method of a spin rectification dc voltage spectrum through fixing the magnetic field and sweeping the frequency has been proposed, which is compared to the common method to acquire a typical spectrum via sweeping an external magnetic field. Based on the shortened microstrip fixture, the measurements of rectified dc voltage as a function of frequency have been performed. From the analysis of results of the permalloy (Py) film with various thicknesses, the magnetic parameters are presented. This method can be used in samples with magnetic domains varied with respect to the external magnetic field, such as, stripe domain structures.

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Section: Methodsmentioning

confidence: 47%

“…However, as shown in Figure , the

V_{D C}^{S R E}

Section: Resultsmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spin Rectification dc Voltage Spectra via Sweeping Frequency

Pan

Soh

Liu

et al. 2019

Physica Status Solidi (b)

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“…This discrepancy of 4πM eff from the bulk saturation value is likely the result of surface anisotropy as well as YIG/NiFe interfacial exchange coupling. However, a negative in-plane effective anisotropy H k can be explained by significant out-of-plane perpendicular anisotropy which tend to lead to the formation of stripe domains for thick NiFe films (>170 nm), as reported in our earlier 36 experiments. As a comparison, we present in Fig.…”

mentioning

confidence: 86%

Non-local detection of spin dynamics via spin rectification effect in yttrium iron garnet/SiO2/NiFe trilayers near simultaneous ferromagnetic resonance

2015

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The spin rectification effect (SRE), a phenomenon that generates dc voltages from ac microwave fields incident onto a conducting ferromagnet, has attracted widespread attention due to its high sensitivity to ferromagnetic resonance (FMR) as well as its relevance to spintronics. Here, we report the non-local detection of yttrium iron garnet (YIG) spin dynamics by measuring SRE voltages from an adjacent conducting NiFe layer up to 200 nm thick. In particular, we detect, within the NiFe layer, SRE voltages stemming from magnetostatic surface spin waves (MSSWs) of the adjacent bulk YIG which are excited by a shorted coaxial probe. These non-local SRE voltages within the NiFe layer that originates from YIG MSSWs are present even in 200 nm-thick NiFe films with a 50 nm thick SiO2 spacer between NiFe and YIG, thus strongly ruling out the mechanism of spin-pumping induced inverse spin Hall effect in NiFe as the source of these voltages. This long-range influence of YIG dynamics is suggested to be mediated by dynamic fields generated from YIG spin precession near YIG/NiFe interface, which interacts with NiFe spins near the simultaneous resonance of both spins, to generate a non-local SRE voltage within the NiFe layer.

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“…Finally, the 1D model allows us to calculate another peculiar property of weak stripe domains, the so-called 'rotatable' anisotropy [20,[76][77][78][79]. The latter strongly affects the magneto-dynamic properties of the thin films [37,79], providing an energy barrier which prevents from the free in-plane rotation of the magnetization vector.…”

Section: Introductionmentioning

confidence: 99%

Stripe domains reorientation in ferromagnetic films with perpendicular magnetic anisotropy

et al. 2020

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Ferromagnetic thin films with moderate perpendicular magnetic anisotropy (PMA) are known to support weak stripe domains provided film thickness exceeds a critical value. In this work, we performed both an experimental and theoretical investigation of a peculiar phenomenon shown by weak stripe domains: namely, the stripe domains reorientation when a dc magnetic field is applied in the film plane along the direction perpendicular to the stripes axis. We focus on bct α′-Fe 8 N 1−x thin films obtained by + N 2 implantation of α-Fe films epitaxially grown on ZnSe/GaAs(001). By using different ion implantation and heat treatment conditions, we show that it is possible to tune the PMA values. Magnetic force microscopy and vibrating sample magnetometer measurements prove the existence of weak stripe domains at remanence, and of a threshold field for the reorientation of the stripes axis in a transversal field. Using a one-dimensional model of the magnetic stripe domains, where the essential parameter is the maximum canting angle of the stripe magnetization out of the film plane, the various contributions to the magnetic energy can be separately calculated. A linear increase of the reorientation threshold field on the PMA is obtained, in qualitative agreement with experimental data in our Fe-N films, as well as in other thin films with weak stripe domains. Finally, we find that also the rotatable anisotropy field linearly increases as a function of the PMA magnitude.

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Magnetization dynamics in permalloy films with stripe domains

Cited by 56 publications

References 40 publications

Spin Rectification dc Voltage Spectra via Sweeping Frequency

Spin Rectification dc Voltage Spectra via Sweeping Frequency

Non-local detection of spin dynamics via spin rectification effect in yttrium iron garnet/SiO2/NiFe trilayers near simultaneous ferromagnetic resonance

Stripe domains reorientation in ferromagnetic films with perpendicular magnetic anisotropy

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