Direct Phase Probing and Mapping via Spintronic Michelson Interferometry

Wirthmann, A.; Fan, Xiaolong; Gui, Y. S.; Martens, K.; Williams, G. V. M.; Dietrich, James; Bridges, Greg E.; Hu, C.‐M.

doi:10.1103/physrevlett.105.017202

Cited by 64 publications

(57 citation statements)

References 14 publications

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“…Indeed, the peculiar line shapes in both cases can be fit by using the combination of symmetric and antisymmetric Lorentzian functions [22]. The fact that such a phase correlation effect is now measured by spin pumping is of particular interest, since it implies that the line shape of spin pumping FMR can be tuned by changing the phase difference between j + (t) and m + (t), as was demonstrated for spin rectification [23]. This may enable microwave coherent control of the pure spin current produced by spin pumping, which was celebrated in semiconductor spintronics by using coherent optical methods [24,25].…”

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confidence: 88%

Spin Pumping in Electrodynamically Coupled Magnon-Photon Systems

et al. 2015

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We use electrical detection, in combination with microwave transmission, to investigate both resonant and non-resonant magnon-photon coupling at room temperature. Spin pumping in a dynamically coupled magnon-photon system is found to be distinctly different from previous experiments. Characteristic coupling features such as modes anti-crossing, line width evolution, peculiar line shape, and resonance broadening are systematically measured and consistently analyzed by a theoretical model set on the foundation of classical electrodynamic coupling. Our experimental and theoretical approach pave the way for pursuing microwave coherent manipulation of pure spin current via the combination of spin pumping and magnon-photon coupling. PACS numbers:Coupling between electrodynamics and magnetization dynamics is a subject of cross-disciplinary and longstanding interest.The nuclear magnetic resonance (NMR) community has studied this effect for decades by measuring the radiation damping of NMR [1]. Engineers have routinely utilized this effect for designing microwave [2] and THz devices [3]. In condensed matter physics, such a coupling leads to the magnon polariton [4], which is an elementary excitation characterized by an intrinsic excitation gap between ferromagnetic resonance (FMR) and ferromagnetic antiresonance [5]. Extrinsically, classical coupling of magnetization dynamics with its electrodynamic surrounding causes Faraday induction of both NMR [6] and FMR [7]. From the perspective of quantum physics, resonant spin-photon coupling plays a central role in utilizing quantum information [8].In 2010, a theoretical work of Soykal and Flatté [9] sparked excitement in the community of spintronics for studying the strong field interaction of magnons and microwave photons. Pioneering experiments have been performed at cryogenic temperatures by Huebl et al. [10] and Tabuchi et al. [11] on the ferromagnetic insulator Yttrium iron garnet (YIG) placed on/in a microwave cavity, in which a large normal mode splitting was found in the transmission measurements, indicating large quantumcoherent magnon-photon coupling. In October 2014, an experimental breakthrough was made by Zhang et al.[12], who demonstrated Rabi-oscillations of the coupled magnon-photon system at room temperature. In the same month, an ultrahigh cooperativity of 10 5 between magnon and photon modes was reported [13]. These exciting works reveal just the tip of the iceberg of the new field of cavity spintronics. * Current affiliation: Department of Physics and Astronomy, University of Denver, Colorado, 80208, USA † Electronic address: hu@physics.umanitoba.ca; URL: http://www.physics.umanitoba.ca/∼hu So far, experiments in this emerging field were performed by measuring either the transmission (S 21 ) or reflection coefficient (S 11 ) of the microwave cavity loaded with a YIG sample. The coupling strength was obtained by fitting these S parameters to the microwave input-output formalism with an added self-energy term attributed to the magnon-photon coupling. This sta...

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confidence: 88%

Spin Pumping in Electrodynamically Coupled Magnon-Photon Systems

et al. 2015

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“…Such nonlinear terms typically lead to the product of j and m. Spin rectifications induced by such magnetoresistance effects are listed in Table I by the terms labeled V MR . The general feature of V MR is that its amplitude depends on both the relative phase Φ and the spin resonance phase Θ, which leads to a characteristic phase signature of the FMR line shape 37,38 .…”

Section: A Brief Review Of Electrical Detection Of Fmrmentioning

confidence: 99%

“…The line shape analysis for the perpendicular case can be found in Ref. 37. In both cases the form of the susceptibility, χ ∝ D + iL, describes the ferromagnetic resonance line shape where each element of χ is the sum of an antisymmetric and symmetric Lorentz line shape.…”

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Analysis of the line shape of electrically detected ferromagnetic resonance

et al. 2011

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)This work reviews and examines two particular issues related with the new technique of electrical detection of ferromagnetic resonance (FMR). This powerful technique has been broadly applied for studying magnetization and spin dynamics over the past few years. The first issue is the relation and distinction between different mechanisms that give rise to a photovoltage via FMR in composite magnetic structures, and the second is the proper analysis of the FMR line shape, which remains the "Achilles heel" in interpreting experimental results, especially for either studying the spin pumping effect or quantifying the spin Hall angles via the electrically detected FMR.

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“…Other studies have also shown that the relative phases of electromagnetic waves are important to consider in FMR exeriments 33,34 . Hence, the phase lag between the applied MW field and the induced field needs to be considered.…”

Section: B Magnetic Field From a Circular Current Loopmentioning

confidence: 99%

Eddy-current effects on ferromagnetic resonance: Spin wave excitations and microwave screening effects

Flovik

Pettersen

Wahlström

2016

Journal of Applied Physics

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We investigate how controlling induced eddy currents in thin film ferromagnet-normal metal (FM/NM) structures can be used to tailor the local microwave (MW) fields in ferromagnetic resonance (FMR) experiments. The MW fields produced by eddy currents will in general have a relative phase shift with respect to the applied MW field which depends on the sample geometry. The induced fields can thus partially compensate the applied MW field, effectively screening the FM in selected parts of the sample. The highly localized fields produced by eddy currents enable the excitation of spin wave modes with non-zero wave vectors (k = 0), in contrast to the uniform k = 0 mode normally excited in FMR experiments. We find that the orientation of the applied MW field is one of the key parameters controlling the eddy-current effects. The induced currents are maximized when the applied MW field is oriented perpendicular to the sample plane. Increasing the magnitude of the eddy currents results in a stronger induced MW field, enabling a more effective screening of the applied MW field as well as an enhanced excitation of spin wave modes. This investigation underlines that eddy currents can be used to control the magnitude and phase of the local MW fields in thin film structures.

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Direct Phase Probing and Mapping via Spintronic Michelson Interferometry

Cited by 64 publications

References 14 publications

Spin Pumping in Electrodynamically Coupled Magnon-Photon Systems

Spin Pumping in Electrodynamically Coupled Magnon-Photon Systems

Analysis of the line shape of electrically detected ferromagnetic resonance

Eddy-current effects on ferromagnetic resonance: Spin wave excitations and microwave screening effects

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