Intrinsic and extrinsic antiferromagnetic damping in NiO

Moriyama, Takahiro; Hayashi, Kensuke; Yamada, K.; Shima, Mutsuhiro; Ohya, Yutaka; Ono, Teruo

doi:10.1103/physrevmaterials.3.051402

Cited by 49 publications

(30 citation statements)

References 34 publications

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“…The temperature dependence of the resonant frequency shown in Fig. 4 is nearly same for all the samples, indicating that the HM granules in the NiO matrix do not influence the magnetic susceptibility, or the exchange constant [ 33 ], and the out-of-the-easy-plane anisotropy both of which are relevant to the resonant frequency [31]. The Néel temperature and the resonant frequency at 0 K are estimated to be T N = 521 ± 2 K and 2 ⁄ = 1.095 ± 0.002 THz, respectively, by the equation where is the normalized sublattice magnetization computed by the Brillouin function and n = 0.72 is the exponent for NiO [30,33].…”

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Enhanced antiferromagnetic resonance linewidth in NiO/Pt and NiO/Pd

et al. 2020

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In this letter, we investigate the enhancement of the antiferromagnetic damping in the sintered NiO-HM granular systems having NiO/HM interfaces, where HM = Pt or Pd. Under the assumption of the spin pumping model, we derive the effective interfacial damping conductance , the parameter which characterizes the upper-bound estimate of the spin pumping effect, to be 12±1 nm-2 and 5±1 nm-2 for the NiO/Pt and the NiO/Pd interfaces, respectively, at room temperature. experimentally derived in this study are an important milestone in antiferromagnetic spintronics, giving a guideline for various spin current transfer and spin interaction phenomena with antiferromagnets where the spin mixing conductance is involved.

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“…air pores. THz wave transmission through the granular pellets was measured by using a frequency domain CW-THz spectroscopy system [30,31] capable of scanning up to 2 THz as the schematic illustration is shown in Fig. 1(b).…”

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Enhanced antiferromagnetic resonance linewidth in NiO/Pt and NiO/Pd

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“…The evanescent spin wave model does not explicitly take temperature dependence into account, in contrast to the thermal magnon model [20], which can naturally explain the enhancement of the spin current near the Néel temperature T N [19,41,43,44]. However, the AFM magnon frequencies decrease as T N is approached [45,46], which should result in an increase in the penetration of the evanescent spin waves and hence an increase of the spin current. Further studies of ac spin current in NiO in the vicinity of T N are desirable, but the construction of the XFMR apparatus does not currently permit the sample to be heated above room temperature.…”

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Coherent Transfer of Spin Angular Momentum by Evanescent Spin Waves within Antiferromagnetic NiO

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Insulating antiferromagnets have recently emerged as efficient and robust conductors of spin current. Element-specific and phase-resolved x-ray ferromagnetic resonance has been used to probe the injection and transmission of ac spin current through thin epitaxial NiO(001) layers. The spin current is found to be mediated by coherent evanescent spin waves of GHz frequency, rather than propagating magnons of THz frequency, paving the way towards coherent control of the phase and amplitude of spin currents within an antiferromagnetic insulator at room temperature.

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“…The quantum particles corresponding to magnetization dynamics -magnons -provide one such avenue for microscopic theories and form the central theme in the field of magnonics [33,34]. While a vast amount of fruitful research has provided a good understanding of ferromagnets (FMs) [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54], analogous studies on antiferromagnets (AFMs) are relatively scarce and have just started appearing [55,56] due to the recently invigorated field of antiferromagnetic spintronics [57][58][59][60][61][62]. Among the ongoing discoveries of niches borne by AFMs, from electrically and rapidly switchable memories [63], topological spintronics [60], long range magnonic transport [64] to quantum fluctuations [65], an unexpected surprise has been encountered in the first principles evaluation of damping in metallic AFMs.…”

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Magnon decay theory of Gilbert damping in metallic antiferromagnets

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Gilbert damping is a key property governing magnetization dynamics in ordered magnets. We present a theoretical study of intrinsic Gilbert damping induced by magnon decay in antiferromagnetic metals through s-d exchange interaction. Our theory delineates the qualitative features of damping in metallic antiferromagnets owing to their bipartite nature, in addition to providing analytic expressions for the damping parameters. Magnoninduced intraband electron scattering is found to predominantly cause magnetization damping, whereas the Néel field is found to be damped via disorder. Depending on the conduction electron band structure, we predict that magnon-induced interband electron scattering around band crossings may be exploited to engineer a strong Néel field damping. arXiv:1907.01045v1 [cond-mat.mes-hall] 1 Jul 2019

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Intrinsic and extrinsic antiferromagnetic damping in NiO

Cited by 49 publications

References 34 publications

Enhanced antiferromagnetic resonance linewidth in NiO/Pt and NiO/Pd

Enhanced antiferromagnetic resonance linewidth in NiO/Pt and NiO/Pd

Coherent Transfer of Spin Angular Momentum by Evanescent Spin Waves within Antiferromagnetic NiO

Magnon decay theory of Gilbert damping in metallic antiferromagnets

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