MAGE (M-file/Mif Automatic GEnerator): A graphical interface tool for automatic generation of Object Oriented Micromagnetic Framework configuration files and Matlab scripts for results analysis

J. Phys. D: Appl. Phys.

et al. 2018

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An analytical model of the spin-diode effect induced by resonant spin-transfer torque in a ferromagnetic bilayer with strong dipolar coupling provides the resonance frequencies and the lineshapes of the magnetic field spectra obtained under field or laser-light modulation. The effect of laser irradiation is accounted for by introducing the temperature dependence of the saturation magnetization and anisotropy, as well as thermal spin-transfer torques. The predictions of the model are compared with experimental data obtained with single Co/Cu/Co spin valves, embedded in nanowires and produced by electrodeposition. Temperature modulation provides excellent signal-to-noise ratio. High temperature-modulation frequency is possible because these nanostructures have a very small heat capacity and are only weakly heat-sunk. The two forms of modulation give rise to qualitative differences in the spectra that are accounted for by the model. 76.50.+g, 75.47.De

Section: A Dispersion Relationmentioning

confidence: 99%

Field- and temperature-modulated spin diode effect in a GMR nanowire with dipolar coupling

Ogrodnik

Vetrò

J. Phys. D: Appl. Phys.

et al. 2018

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“…The exchange constant was set to 1.3 × 10 −11 J/m and the discretization cell size was set to 2 × 2 × 1 nm 3 . To perform micromagnetic simulations, we utilized OOMMF package 25 with our custom software 26,27 . The magnetization dynamics was governed by the Landau-Lifshitz-Gilbert equation with Slonczewski's term [28][29][30][31] , where the input current was assumed to originate from a constant voltage source and the magnetoresistance was calculated dynamically in each simulation cell 26 .…”

Section: A Sto Frequency Oscillationmentioning

confidence: 99%

Simultaneous readout of two adjacent bit tracks with a spin-torque oscillator

Chęciński

Journal of Magnetism and Magnetic Materials

Stobiecki

2018

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We propose a novel setup for a spin-torque oscillator reader in magnetic hard disk drive technology. Two adjacent bit tracks are to be read simultaneously, leading to high data transfer rate and increased resilience to noise as the lateral size of the oscillator device is allowed to remain larger than the bit width. We perform micromagnetic simulations of an example system and find that the magnetization response has a clear unimodal character, which enables for detection of two bit values at the same time. We analyze the frequency of the device under the influence of two different external fields and conduct a simulation of a successful dynamic readout. We estimate the signal linewidth and signal-to-noise ratios of the setup and show that it may be potentially beneficial for magnetic readout applications.

“…In order to confirm that the measured modes are SS-WRs and identify thier harmonic number, we performed a set of micromagnetic simulations of FMR and SSWR angular dependences and their behaviour in an electric field. We utilized OOMMF software 20 together with our custom extensions 21,22 allowing for fast and efficient preparation of the simulation files and analysis of the obtained results. We assumed the following parameters for the NiFe strips: ferromagnetic exchange constant equal to 1.3 • 10 −11 J/m, damping constant α = 0.007, mesh qubic cell size equal to 5 nm.…”

Section: Micromagnetic Simulationsmentioning

confidence: 99%

“…We utilized OOMMF software 20 together with our custom extensions 21,22 allowing for fast and efficient preparation of the simulation files and analysis of the obtained results. We assumed the following parameters for the NiFe strips: ferromagnetic exchange constant equal to 1.3 · 10 −11 J/m, damping constant α = 0.007, mesh qubic cell size equal to 5 nm.…”

Section: Micromagnetic Simulationsmentioning

confidence: 99%

Electric-field tunable spin waves in PMN-PT/NiFe heterostructure: Experiment and micromagnetic simulations

Ziętek

Chęciński

Journal of Magnetism and Magnetic Materials

et al. 2017

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We present a comprehensive theoretical and experimental study of voltage-controlled standing spin waves resonance (SSWR) in PMN-PT/NiFe multiferroic heterostructures patterned into microstrips. A spin-diode technique was used to observe ferromagnetic resonance (FMR) mode and SSWR in NiFe strip mechanically coupled with a piezoelectric substrate. Application of an electric field to a PMN-PT creates a strain in permalloy and thus shifts the FMR and SSWR fields due to the magnetostriction effect. The experimental results are compared with micromagnetic simulations and a good agreement between them is found for dynamics of FMR and SSWR with and without electric field. Moreover, micromagnetic simulations enable us to discuss the amplitude and phase spatial distributions of FMR and SSWR modes, which are not directly observable by means of spin diode detection technique.