Penetration depth and absorption mechanisms of spin currents in Ir20Mn80 and Fe50Mn50 polycrystalline films by ferromagnetic resonance and spin pumping

Merodio, Pablo; Ghosh, Abhijit; Lemonias, Christophe; Gautier, Éric; Ebels, U.; Chshiev, M.; Béa, Hélène; Baltz, Vincent; Bailey, W. E.

doi:10.1063/1.4862971

Cited by 66 publications

(63 citation statements)

References 43 publications

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“…Recently, an experimental investigation showing large spin-mixing conductance at AF|metal interfaces, consistent with our expectation, was reported in Ref. 9, based on ferromagnetic resonance and spin pumping. Further experimental studies of the spin-mixing conductance for an AF|metal interface are desired.…”

Section: Disordered Interfacial Exchange Couplingsupporting

confidence: 65%

“…8 A very recent experiment has investigated absorption mechanisms of spin currents in antiferromagnetic metals, Ir 20 Mn 80 and Fe 50 Mn 50 , at room temperature. 9 On another front, the notion of spin superfluidity in magnetic systems is currently gaining momentum. 10,11 Applying the ideas from conventional U(1) superfluidity and superconductivity to insulating magnetic systems is a focus of this endeavor.…”

Section: Introductionmentioning

confidence: 99%

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Superfluid spin transport through antiferromagnetic insulators

et al. 2014

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A theoretical proposal for realizing and detecting spin supercurrent in an isotropic antiferromagnetic insulator is reported. Superfluid spin transport is achieved by inserting the antiferromagnet between two metallic reservoirs and establishing a spin accumulation in one reservoir such that a spin bias is applied across the magnet. We consider a class of bipartite antiferromagnets with Néel ground states, and temperatures well below the ordering temperature, where spin transport is mediated essentially by the condensate. Landau-Lifshitz and magnetocircuit theories are used to directly relate spin current in different parts of the heterostructure to the spin-mixing conductances characterizing the antiferromagnet|metal interfaces and the antiferromagnet bulk damping parameters, quantities all obtainable from experiments. We study the efficiency of spin angular-momentum transfer at an antiferromagnet|metal interface by developing a microscopic scattering theory for the interface and extracting the spin-mixing conductance for a simple model. Within the model, a quantitative comparison between the spin-mixing conductances obtained for the antiferromagnet|metal and ferromagnet|metal interfaces is made.

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Section: Disordered Interfacial Exchange Couplingsupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Superfluid spin transport through antiferromagnetic insulators

et al. 2014

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“…A spin diffusion length of around 2 nm in FeMn is obtained by quantifying the field-like effective field induced in NiFe, which is comparable to the ST-FMR 33 and spin pumping 32 measurements. Our results suggest that in ultra-thin polycrystalline AFMs, due to the relatively small exchange field between spin sublattices, the spin current can interact with AFM, causing reorientation of the spin sublattices, in a similar way as it does with the FM.…”

Section: Introductionmentioning

confidence: 72%

Fieldlike spin-orbit torque in ultrathin polycrystalline FeMn films

Yang

Zhang

et al. 2016

Phys. Rev. B

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“…When injected into other ferromagnets (F 2 in F 1 /N/F 2 ), the spin current is absorbed through its torque on magnetization 5,7 . A similar process appears to be relevant for antiferromagnets as well 8 .…”

mentioning

confidence: 96%

Large spin pumping effect in antisymmetric precession of Ni79Fe21/Ru/Ni79Fe21

Yang

Bailey

2016

Applied Physics Letters

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In magnetic trilayer structures, a contribution to the Gilbert damping of ferromagnetic resonance arises from spin currents pumped from one layer to another. This contribution has been demonstrated for layers with weakly coupled, separated resonances, where magnetization dynamics are excited predominantly in one layer and the other layer acts as a spin sink. Here we show that trilayer structures in which magnetizations are excited simultaneously, antisymmetrically, show a spin-pumping effect roughly twice as large. The antisymmetric (optical) mode of antiferromagnetically coupled Ni 79 Fe 21 (8nm)/Ru/Ni 79 Fe 21 (8nm) trilayers shows a Gilbert damping constant greater than that of the symmetric (acoustic) mode by an amount as large as the intrinsic damping of Py (∆α 0.006). The effect is shown equally in field-normal and field-parallel to film plane geometries over 3-25 GHz. The results confirm a prediction of the spin pumping model and have implications for the use of synthetic antiferromagnets (SAF)-structures in GHz devices.Pumped spin currents 1,2 are widely understood to influence the magnetization dynamics of ultrathin films and heterostructures. These spin currents increase the Gilbert damping or decrease the relaxation time for thin ferromagnets at GHz frequencies. The size of the effect has been parametrized through the effective spin mixing conductance g ↑↓ r , which relates the spin current pumped out of the ferromagnet, transverse to its static (timeaveraged) magnetization, to its precessional amplitude and frequency. The spin mixing conductance is interesting also because it determines the transport of pure spin current across interfaces in quasistatic spin transport, manifested in e.g. the spin Hall effect.In the spin pumping effect, spin current is pumped away from a ferromagnet / normal metal (F 1 /N) interface, through precession of F 1 , and is absorbed elsewhere in the structure, causing angular momentum loss and damping of F 1 . The spin current can be absorbed through different processes in different materials. When injected into paramagnetic metals (Pt, Pd, Ru, and others), the spin current relaxes exponentially with paramagnetic layer thickness 3-5 . The relaxation process has been likened to spin-flip scattering as measured in CPP-GMR, where spin-flip events are localized to heavy-metal impurities 6 and the measurement reveals the spin diffusion length λ SD . When injected into other ferromagnets (F 2 in F 1 /N/F 2 ), the spin current is absorbed through its torque on magnetization 5,7 . A similar process appears to be relevant for antiferromagnets as well 8 .In F 1 /N/F 2 structures, only half of the total possible spin pumping effect has been detected up until now. For well-separated resonances of F 1 and F 2 , only one layer will precess with large amplitude at a given frequency ω, and spin current is pumped from a precessing F 1 into a static F 2 . If both layers precess symmetrically, with a) Electronic mail: Contact author. web54@columbia.edu the same amplitude and phase, equal and ...

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Penetration depth and absorption mechanisms of spin currents in Ir₂₀Mn₈₀ and Fe₅₀Mn₅₀ polycrystalline films by ferromagnetic resonance and spin pumping

Cited by 66 publications

References 43 publications

Superfluid spin transport through antiferromagnetic insulators

Superfluid spin transport through antiferromagnetic insulators

Fieldlike spin-orbit torque in ultrathin polycrystalline FeMn films

Large spin pumping effect in antisymmetric precession of Ni79Fe21/Ru/Ni79Fe21

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