Low Gilbert damping in Co2FeSi and Fe2CoSi films

Sterwerf, Christian; Paul, Soumalya; Khodadadi, Behrouz; Meinert, Markus; Schmalhorst, Jan-Michael; Buchmeier, M.; Mewes, Claudia; Mewes, Tim; Reiss, Günter

doi:10.1063/1.4960705

Cited by 36 publications

(25 citation statements)

References 34 publications

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“…Furthermore, our discovery of a material that enables high TMS ratios paves the way to a large number of new effects. The combination of the high TMS effect, high spin-polarization, and low Gilbert damping 45 makes these Heusler compound MTJs ideal for investigating the thermal spin transfer torque in MTJs [46][47][48] , which is a key ingredient in the design of spin caloritronic memory de-…”

Section: Discussionmentioning

confidence: 99%

Large magneto-Seebeck effect in magnetic tunnel junctions with half-metallic Heusler electrodes

et al. 2017

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Spin caloritronics studies the interplay between charge-, heat- and spin-currents, which are initiated by temperature gradients in magnetic nanostructures. A plethora of new phenomena has been discovered that promises, e.g., to make wasted heat in electronic devices useable or to provide new read-out mechanisms for information. However, only few materials have been studied so far with Seebeck voltages of only some microvolt, which hampers applications. Here, we demonstrate that half-metallic Heusler compounds are hot candidates for enhancing spin-dependent thermoelectric effects. This becomes evident when considering the asymmetry of the spin-split density of electronic states around the Fermi level that determines the spin-dependent thermoelectric transport in magnetic tunnel junctions. We identify Co2FeAl and Co2FeSi Heusler compounds as ideal due to their energy gaps in the minority density of states, and demonstrate devices with substantially larger Seebeck voltages and tunnel magneto-Seebeck effect ratios than the commonly used Co-Fe-B-based junctions.

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Section: Discussionmentioning

confidence: 99%

Large magneto-Seebeck effect in magnetic tunnel junctions with half-metallic Heusler electrodes

et al. 2017

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“…The ferromagnetic resonance properties of the samples were measured using a custom designed broadband ferromagnetic resonance setup which uses a coplanar waveguide for microwave excitation and operates in the 1 65 frequency range [18][19][20][21][22] .At a fixed microwave frequency, the external magnetic field is swept through the resonance field of the sample. The microwave loss at the resonance condition can be detected by measuring the transmitted microwave power through the sample.…”

Section: Methodsmentioning

confidence: 99%

Interlayer Exchange Coupling in Asymmetric Co−Fe/Ru/Co−Fe Trilayers Investigated with Broadband Temperature-Dependent Ferromagnetic Resonance

et al. 2017

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We report on a comprehensive study of the interlayer exchange coupling in CoFe(5nm)/Ru(x)/CoFe(8nm) trilayers (x=0.8…2.8 nm), using broadband ferromagnetic resonance. A systematic frequency dependence of the field separation between the acoustic and optic modes is found, which is caused by different effective magnetizations of the two ferromagnetic layers. Hence, it is shown that the broadband measurements are vital for reducing the systematic error margins in the determination of interlayer exchange coupling using ferromagnetic resonance. We have also investigated the temperature dependence of the interlayer exchange coupling and compare our results with existing theories. It is shown that models which take into account the temperature dependence due to thermal excitations of spin waves within the ferromagnetic layers, have a considerably better agreement with the experiment than models solely based on spacer and interface contributions to the temperature dependence.

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“…investigate the magnetic relaxation mechanisms in ferromagnetic thin films, as well as spin pumping into adjacent nonmagnetic layers [22][23][24][25][26] . In this work, we employ FMR to probe the above mentioned situation of spin pumping into a layer undergoing a ferromagnetic ordering transition by studying transition metal/rare earth bilayers.…”

Section: Broadband Ferromagnetic Resonance (Fmr) Is a Technique That mentioning

confidence: 99%

Enhanced spin pumping near a magnetic ordering transition

et al. 2017

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We study the temperature-dependent static and dynamic magnetic properties of polycrystalline permalloy (Ni 80 Fe 20 , Py)/Gd bilayers using DC magnetometry and broadband ferromagnetic resonance. Magnetometry measurements reveal that the 3-nm-thick Gd layers undergo a magnetic ordering transition below 100 K, consistent with finite size suppression of their Curie temperature. Upon cooling below this Gd ordering temperature, ferromagnetic resonance spectroscopy reveals a sharp increase in both the gyromagnetic ratio (γ) and effective Gilbert damping parameter (α) of the neighboring Py layers. The increase of γ is attributed to the onset of strong antiferromagnetic coupling between the Gd and Py layers as the Gd orders magnetically. We argue that the increase of α, on the other hand, can be explained by spin pumping into the rare earth layer when taking into account the increase of γ, the decrease of the Gd spin diffusion length as it orders, and, most significantly, the corresponding increase of the Py/Gd interfacial spin mixing conductance in the vicinity of the magnetic ordering transition. We propose that these observations constitute a qualitative confirmation of a recent theoretical prediction of spin sinking enhancement in this situation.2

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Low Gilbert damping in Co2FeSi and Fe2CoSi films

Cited by 36 publications

References 34 publications

Large magneto-Seebeck effect in magnetic tunnel junctions with half-metallic Heusler electrodes

Large magneto-Seebeck effect in magnetic tunnel junctions with half-metallic Heusler electrodes

Interlayer Exchange Coupling in Asymmetric Co−Fe/Ru/Co−Fe Trilayers Investigated with Broadband Temperature-Dependent Ferromagnetic Resonance

Enhanced spin pumping near a magnetic ordering transition

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