Spin current from sub-terahertz-generated antiferromagnetic magnons

Li, Junxue; Wilson, C. Blake; Cheng, Ran; Lohmann, Mark; Kavand, Marzieh; Yuan, Wei; Aldosary, Mohammed; Agladze, N. I.; Peng, Wei; Sherwin, Mark S.; Shi, Jing

doi:10.1038/s41586-020-1950-4

Cited by 267 publications

(229 citation statements)

References 29 publications

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“…This effective magnetic field may influence the spin fluctuations at the IrMn/CoFeB interface and eventually enhance the Seebeck coefficient. Furthermore, the magnon spin current at the interface of IrMn/CoFeB can contribute to the spin Seebeck effect as studied previously 28,29,31,33,66,67 , but the electric voltage due to this effect is perpendicular to the temperature gradient and typically three orders of magnitude smaller than the Seebeck voltage detected in this work.…”

Section: Resultssupporting

confidence: 54%

Record thermopower found in an IrMn-based spintronic stack

Ziman

et al. 2020

Nat Commun

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The Seebeck effect converts thermal gradients into electricity. As an approach to power technologies in the current Internet-of-Things era, on-chip energy harvesting is highly attractive, and to be effective, demands thin film materials with large Seebeck coefficients. In spintronics, the antiferromagnetic metal IrMn has been used as the pinning layer in magnetic tunnel junctions that form building blocks for magnetic random access memories and magnetic sensors. Spin pumping experiments revealed that IrMn Néel temperature is thickness-dependent and approaches room temperature when the layer is thin. Here, we report that the Seebeck coefficient is maximum at the Néel temperature of IrMn of 0.6 to 4.0 nm in thickness in IrMn-based half magnetic tunnel junctions. We obtain a record Seebeck coefficient 390 (±10) μV K −1 at room temperature. Our results demonstrate that IrMnbased magnetic devices could harvest the heat dissipation for magnetic sensors, thus contributing to the Power-of-Things paradigm.

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Section: Resultssupporting

confidence: 54%

Record thermopower found in an IrMn-based spintronic stack

Ziman

et al. 2020

Nat Commun

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“…The effects of the direction switching of the vector L under the spincurrent action [47,48] were observed. The resonant spin pumping using an AFM as an active element was performed at frequencies up to 200 GHz [49] and up to 450 GHz [50].…”

Section: Introduction and Formulation Of The Problemmentioning

confidence: 99%

“…Owing to the inverse spin Hall effect, this spin current creates an electric current j ISH in the metal, which flows along the surface in a direction perpendicular to j sp . Heavy metals with strong spin-orbit interaction, such as platinum (Pt) or tantalum (Ta), for which the spin Hall effect is substantial [49], are chosen for such devices. If the spin current j sp is alternating, the desired signal is obtained in the form of an alternating electric current (for details, see works [57,59,98]).…”

Section: The Application Of Afm Disclinations In Spintronicsmentioning

confidence: 99%

“…Because of the condition p ‖ e, the EA AFM must lie in the film plane in this case. This geometry was used in works [49,50] while studying the spin pumping with the help of AFM. Assuming e ‖ e , we obtain that e 1 ‖ e , e 2 ‖ e , j sp ∝ e sin cos cos , and the alternating electric current, which is directed perpendicularly to j sp , flows in the direction of the -axis, i.e.…”

Section: The Application Of Afm Disclinations In Spintronicsmentioning

confidence: 99%

“…In doing so, the signals of the same sign should be summed up. Here, a trick used in work [49] can be applied: two nanowires made of heavy metals with different signs of the spin-Hall angle, i.e. different ratios between the spin and electric currents, should be arranged in parallel to each other.…”

Section: The Application Of Afm Disclinations In Spintronicsmentioning

confidence: 99%

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Spin Dynamics in Antiferromagnets with Domain Walls and Disclinations

et al. 2020

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The spin dynamics in antiferromagnets with atomic dislocations and dislocation-induced spin disclinations has been discussed. It is shown how the usual sigma-model equation can be used to describe it. The dynamical states with the spatially inhomogeneous spin precession are studied. It is demonstrated that such an internal dynamics of the spin disclinations and the related domain walls can serve as a basis for creating a spin-Hall nanogenerator pumped with a spin current and characterized by a low excitation threshold.

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Ultrastrong Magnon–Magnon Coupling and Chirality Switching in Antiferromagnet CrPS₄

Dai

et al. 2023

Adv Funct Materials

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As new information carriers, antiferromagnetic magnons have great potential in the fields of spintronics and quantum information. However, the strong exchange interaction between sublattice spins in conventional antiferromagnets results in their frequencies up to the terahertz (THz) range, hindering further exploration of related applications and physics. Recently, emerging van der Waals A‐type antiferromagnets with the weak exchange interaction may bring about a change. In this study, it demonstrates two distinct tunable ultrastrong magnon–magnon couplings in the gigahertz (GHz) band using this type of antiferromagnet, CrPS4, with a maximum normalized coupling strength (η) of 0.31. It establishes orthorhombic and monoclinic models for theoretical analyses, unambiguously showing that the ultrastrong coupling strength is caused by unique magnetocrystalline anisotropy rather than exchange enhancement. Furthermore, for the first time, it observes a continuous switching process of sublattice magnon chirality arising from the orthorhombic nature of anisotropy. These findings not only deepen the understanding of antiferromagnetic spin dynamics but also offer a powerful platform for building magnonic quantum systems and chirality‐based spintronics.

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Spin current from sub-terahertz-generated antiferromagnetic magnons

Cited by 267 publications

References 29 publications

Record thermopower found in an IrMn-based spintronic stack

Record thermopower found in an IrMn-based spintronic stack

Spin Dynamics in Antiferromagnets with Domain Walls and Disclinations

Ultrastrong Magnon–Magnon Coupling and Chirality Switching in Antiferromagnet CrPS₄

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Spin current from sub-terahertz-generated antiferromagnetic magnons

Cited by 267 publications

References 29 publications

Record thermopower found in an IrMn-based spintronic stack

Record thermopower found in an IrMn-based spintronic stack

Spin Dynamics in Antiferromagnets with Domain Walls and Disclinations

Ultrastrong Magnon–Magnon Coupling and Chirality Switching in Antiferromagnet CrPS4

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Ultrastrong Magnon–Magnon Coupling and Chirality Switching in Antiferromagnet CrPS₄