Magnetostatic modes observed in thin single-crystal films of yttrium iron garnet at Q-band frequencies

Duncan, J A; Storey, B E; Tooke, A O; Cracknell, A. P.

doi:10.1088/0022-3719/13/10/028

Cited by 9 publications

(3 citation statements)

References 18 publications

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“…Analyzing the shape of the antiferromagnetic resonance measurements requires one to carefully disentangle the contribution from magnetostatic modes. In ferromagnetic crystals, the observation of magnetostatic modes in resonance measurements is a common feature that appears in materials with low magnetic damping like YIG 38 . At low magnetic fields, the magnetostatic modes lead to an artificial broadening of the FMR peak and large magnetic fields are required to resolve each peak individually.…”

Section: Methodsmentioning

confidence: 99%

Long-distance spin-transport across the Morin phase transition up to room temperature in ultra-low damping single crystals of the antiferromagnet α-Fe2O3

et al. 2020

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Antiferromagnetic materials can host spin-waves with polarizations ranging from circular to linear depending on their magnetic anisotropies. Until now, only easy-axis anisotropy antiferromagnets with circularly polarized spin-waves were reported to carry spin-information over long distances of micrometers. In this article, we report long-distance spin-transport in the easy-plane canted antiferromagnetic phase of hematite and at room temperature, where the linearly polarized magnons are not intuitively expected to carry spin. We demonstrate that the spin-transport signal decreases continuously through the easy-axis to easy-plane Morin transition, and persists in the easy-plane phase through current induced pairs of linearly polarized magnons with dephasing lengths in the micrometer range. We explain the long transport distance as a result of the low magnetic damping, which we measure to be ≤ 10−5 as in the best ferromagnets. All of this together demonstrates that long-distance transport can be achieved across a range of anisotropies and temperatures, up to room temperature, highlighting the promising potential of this insulating antiferromagnet for magnon-based devices.

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Section: Methodsmentioning

confidence: 99%

Long-distance spin-transport across the Morin phase transition up to room temperature in ultra-low damping single crystals of the antiferromagnet α-Fe2O3

et al. 2020

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“…where γ is the gyromagnetic ratio, α 10 −4 is the Gilbert damping parameter of YIG [15], M S = 1.4 • 10 5 A m −1 is the magnitude of the effective saturation magnetisation of YIG at room temperature [16]. The effective magnetic induction field B eff includes the external field B ext , the demagnetising field B dem , the anisotropy field B ani , which behaves as an effective saturation magnetisation in the linear response [17] and finally a thermally induced field B ind given by the relation (3). The exchange field B int [18] is negligible in the following, as we consider magnetostatic modes [19].…”

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confidence: 99%

Evidence for a Magnetic Seebeck Effect

et al. 2013

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The irreversible thermodynamics of a continuous medium with magnetic dipoles predicts that a temperature gradient in the presence of magnetization waves induces a magnetic induction field, which is the magnetic analog of the Seebeck effect. This thermal gradient modulates the precession and relaxation. The magnetic Seebeck effect implies that magnetization waves propagating in the direction of the temperature gradient and the external magnetic induction field are less attenuated, while magnetization waves propagating in the opposite direction are more attenuated.

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“…This value of gives the best fit, but it is substantially larger than the bulk value around 1780 G. This accounts for other anisotropy fields not reflected by other terms in (1). Hence the value of used here can be taken as the value of an effective magnetization that includes the total of the anisotropy effects [21].…”

Section: Theorymentioning

confidence: 99%