Epitaxial patterning of nanometer-thick Y3Fe5O12films with low magnetic damping

Li, Shaozhen; Zhang, Wei; Ding, J.; Pearson, John; Novosad, V.; Hoffmann, Axel

doi:10.1039/c5nr06808h

Cited by 44 publications

(39 citation statements)

References 32 publications

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“…The material parameters used in the theoretical calculation are Ms(YIG) = 1960 G, exchange constant A(YIG) = 410 -7 erg/cm, and damping factor α(YIG) = 7.561×10 −4 . 31 For the first step, the waveguide spin wave modes in a microstripe can be described based on the dipole-exchange theory of the spin wave dispersion spectra in a continuous magnetic film. 43,44 This theory provides explicit relations between the wave vector k = (kx, ky) and the frequency f of the spin waves:…”

Section: Analytical Calculationsmentioning

confidence: 99%

Controlled interconversion of quantized spin wave modes via local magnetic fields

et al. 2019

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In the emerging field of magnonics, spin waves are considered for information processing and transmission at high frequencies. Towards this end, the manipulation of propagating spin waves in nanostructured waveguides for novel functionality has recently been attracting increasing focus of research. Excitations with uniform magnetic fields in such waveguides favors symmetric spin wave modes with odd quantization numbers. Interference between multiple odd spin wave modes leads to a periodic self-focusing effect of the propagating spin waves. Here we demonstrate, how antisymmetric spin wave modes with even quantization numbers can be induced by local magnetic fields in a well-controlled fashion. The resulting interference patterns are discussed within an analytical model and experimentally demonstrated using microfocused Brillouin light scattering (μ-BLS).

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Section: Analytical Calculationsmentioning

confidence: 99%

Controlled interconversion of quantized spin wave modes via local magnetic fields

et al. 2019

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“…However, the edge-localized SWs can hardly be detected in YIG microstripe because they are spatially confined in an extremely narrow region. 30 In this work, the SW FDM function is realized in YIG magnetic microstripe magnetized under a magnetic field gradient induced by a proximate Py microstripe (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Spin-wave frequency division multiplexing in an yttrium iron garnet microstripe magnetized by inhomogeneous field

Zhang

Vogel

Holanda

et al. 2019

Applied Physics Letters

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Spin waves are promising candidates for information processing and transmission in a broad frequency range. In the realization of magnonic devices, the frequency depended division of the spin wave frequencies is a critical function for parallel information processing. In this work, we demonstrate a proof-of-concept spin-wave frequency division multiplexing method by magnetizing a homogenous magnetic microstripe with an inhomogeneous field. The symmetry breaking additional field is introduced by a permalloy stripe simply placed in lateral proximity to the waveguide. Spin waves with different frequencies can propagate independently, simultaneously and separately in space along the shared waveguide. This work brings new potentials for parallel information transmission and processing in magnonics.

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“…Our results provide important insights for improving the coupling strength and coherence in magnon-magnon hybrid systems and pave the way for coherent information processing with exchange coupled magnetic heterostructures.The samples consist of YIG(100 nm)/Py(t Py ) bilayers where t Py varies from 5 nm to 60 nm. YIG(100 nm) films were deposited by magnetron sputtering from a YIG target onto Gd 3 Ga 5 O 12 (111) substrates and annealed in air to reach low-damping characteristics [39]. Before the deposition of Py films on top of YIG, the YIG surfaces were ion milled in vacuum for one minute in order to enable good exchange coupling between Py and YIG [40].…”

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Coherent Spin Pumping in a Strongly Coupled Magnon-Magnon Hybrid System

et al. 2020

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We experimentally identify coherent spin pumping in the magnon-magnon hybrid modes of permalloy/yttrium iron garnet (Py/YIG) bilayers. Using broadband ferromagnetic resonance, an "avoided crossing" is observed between the uniform mode of Py and the spin wave mode of YIG due to the fieldlike interfacial exchange coupling. We also identify additional linewidth suppression and enhancement for the in-phase and out-of-phase hybrid modes, respectively, which can be interpreted as concerted dampinglike torque from spin pumping. Our analysis predicts inverse proportionality of both fieldlike and dampinglike torques to the square root of the Py thickness, which quantitatively agrees with experiments.Coherent information processing has recently become an emerging topic for the post-CMOS electronics era [1,2]. In spintronics, exchange-induced magnetic excitations, called spin waves, or magnons [3,4], are good candidates because information can be encoded by both the amplitude and the phase of spin waves. For example, the interference of coherent spin waves can be engineered for spin wave logic operations [5][6][7]; the coherent interaction of spin-torque oscillators leads to mutual synchronization [8][9][10][11][12][13], which can be applied in artificial neural networks [14,15]; and the coherent coupling between magnons and microwave cavities [16][17][18][19][20][21][22] opens up new opportunities for magnon-based quantum information science [23,24].Recently, strong coupling between two magnonic systems has been observed [25][26][27], which allows excitations of forbidden spin wave modes and high group velocity of propagating spin waves [28,29]. The coupling is dominated by the exchange interaction at the interface of the magnetic bilayers, providing a new pathway to coherently transfer magnon excitations between two magnetic systems possessing distinctive properties: from conductor to insulator, from uniform to nonuniform mode and from high-damping to low-damping systems. However, the underlying physical mechanisms of the coupling are still not fully understood. First, what are the key parameters that dictate the coupling efficiency and enable one to reach the strong-coupling regime? Second, with the interfacial exchange coupling acting as a fieldlike torque, is there a dampinglike torque associated with spin pumping [30][31][32][33]? The second question is particularly important for optimizing the coherence of spin wave transfer in hybrid systems. Furthermore, any parasitic effect on the incoherent spin current from the conduction band is well-removed [34-36] by using magnetic insulators such as yttrium iron garnet (Y 3 Fe 5 O 12 , YIG) [29,37,38], which facilitates the study of spin pumping coherency.In this work, we study YIG/permalloy (Ni 80 Fe 20 , Py) bilayers with varying Py thicknesses. By using a much thinner YIG film compared with previous work [25,27], we define well-separated perpendicular standing spin wave (PSSW) modes in YIG and create an avoided crossing much larger than the linewidths, allowing us to stud...

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Epitaxial patterning of nanometer-thick Y₃Fe₅O₁₂films with low magnetic damping

Cited by 44 publications

References 32 publications

Controlled interconversion of quantized spin wave modes via local magnetic fields

Controlled interconversion of quantized spin wave modes via local magnetic fields

Spin-wave frequency division multiplexing in an yttrium iron garnet microstripe magnetized by inhomogeneous field

Coherent Spin Pumping in a Strongly Coupled Magnon-Magnon Hybrid System

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