Local Excitation of Magnetostatic Modes in YIG

Papa, Elisa; Barnes, S. E.; Ansermet, Jean-Philippe

doi:10.1109/tmag.2012.2229386

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…where n x,y,z ∈ N [20]. The eigenstates of the excitation field b k and the response field m k are related through the magnetic susceptibility χ k , i.e.…”

Section: Cumentioning

confidence: 99%

“…We found evidence for the Magnetic Seebeck effect by exciting locally, at angular frequency ω 2.74 • 10 10 s −1 , the ferromagnetic resonance of a YIG slab of length L z = 10 −2 m, width L y = 2 • 10 −3 m and thickness L x = 2.5 • 10 −5 m, subjected to a temperature gradient as small as |∇ T | 2 • 10 3 K m −1 generated by Peltier elements. The excitation field is applied on the slab using a local antenna as detailed in reference [20]. For signal transmission experiments, two antennae are used, set approximatively 8 mm apart, as shown on Fig.…”

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confidence: 99%

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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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“…where n x,y,z ∈ N [20]. The eigenstates of the excitation field b k and the response field m k are related through the magnetic susceptibility χ k , i.e.…”

Section: Cumentioning

confidence: 99%

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confidence: 99%

Evidence for a Magnetic Seebeck Effect

et al. 2013

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“…The magnetic field is applied along the YIG strip, and spin waves are excited by one microprobe and detected by another. Alternatively, a microcoil [23] was used for excitation. Excitation and detection are 800 μm apart.…”

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Thermal spin torques in magnetic insulators

Brechet

Che

et al. 2017

Phys. Rev. B

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The damping of spin waves transmitted through a two-port magnonic device implemented on a yttrium iron garnet thin film is shown to be proportional to the temperature gradient imposed on the device. The sign of the damping depends on the relative orientation of the magnetic field, the wave vector, and the temperature gradient. The observations are accounted for qualitatively and quantitatively by using an extension of the variational principle that leads to the Landau-Lifshitz equation. All parameters of the model can be obtained by independent measurements. DOI: 10.1103/PhysRevB.95.104432 The discovery of giant magnetoresistance (GMR) revolutionized information storage technology [1,2] and the spin-transfer torque (STT), predicted two decades ago by Slonczewski [3] and Berger [4], may reshape once again the magnetic memory industry [5]. The concept of a heat-driven spin torque, or thermal spin-transfer torque (TST), has been suggested [6][7][8] and opened the world of spin caloritronics. Magnetic insulators are ideal for studying the fundamentals of spin caloritronics, because they are free of the effect of heat on charge transport. Here, we demonstrate that a spin torque can be induced in magnetic insulators by applying a thermal gradient. The effect is not linked to spin-dependent transport at interfaces since we observe a heat-driven contribution to damping of magnetization waves on a millimeter scale. We show that by adding to M(r) the bound magnetic current (∇ × M) as state variable, the variational principle that yields the Landau-Lifshitz equation predicts the presence of a thermal spin torque, from which we derive an expression for spin currents in insulators. Our experiments verify the key predictions of this model. Thermodynamics can predict a link between heat and magnetization, but cannot determine the strength of the effect [9].Spin caloritronics studies the interplay of spin, charge, and heat transport [10]. As the spin dependence of the electrical conductivity proved to be important since it gives rise to GMR, the spin dependence of other transport parameters has been investigated, such as that of the Seebeck [11] and Peltier coefficients [12]. The combination of heat with spin and charge transport gained widespread attention owing to studies of the spin Seebeck effect [13,14]. The STT effect which uses a spinpolarized electrical current has shown promising applications, e.g., in magnetic memories (STT-MRAM). It was already established that heat flowing through a ferromagnetic metal can generate a diffusive spin current [15] which induces a spin torque when flowing through a magnetic nanostructure [6]. Experimentally, this effect was studied in Co/Cu/Co spin valve nanowires by observing the change in the switching * haiming.yu@buaa.edu.cn † jean-philippe.ansermet@epfl.ch field of magnetization due to a local thermal gradient [7]. It was later shown that heat couples to magnetization dynamics [16][17][18]. The effect of heat on magnetization was also found in magnetic tunnel junctions [19] and...

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“…Thus, the MI measurements provide a precise and effective way to investigate the magnetic properties such as the anisotropy field, effective magnetization, the gyromagnetic ratio, and Gilbert damping of the magnetic material by measuring the impedance of the strip coil. Understanding the anisotropy field-dependent resonance mode dispersions in the low-frequency mode could be helpful for designing the YIG-based low-frequency resonators, oscillators, filters, and magnonic devices. − The method can be widely used for metals, semiconductors, and insulators.…”

Section: Discussionmentioning

confidence: 99%

Magnetoimpedance of Epitaxial Y₃Fe₅O₁₂ (001) Thin Film in Low-Frequency Regime

Medwal

Chaudhuri

Vas

et al. 2020

ACS Appl. Mater. Interfaces

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The atomically flat interface of the Y3Fe5O12 (YIG) thin film and the Gd3Ga5O12 (GGG) substrate plays a vital role in obtaining the magnetization dynamics of YIG below and above the anisotropy field. Here, magnetoimpedance (MI) is used to investigate the magnetization dynamics in fully epitaxial 45 nm YIG thin films grown on the GGG (001) substrates using a copper strip coil in the MHz–GHz frequency region. The resistance (R) and reactance (X), which are components of impedance (Z), allow us to probe the absorptive and dispersive components of the dynamic permeability, whereas a conventional spectrometer only measures the field derivative of the power absorbed. The distinct excitation modes arising from the resonance in the uniform and dragged magnetization states of YIG are respectively observed above and below the anisotropy field. The magnetodynamics clearly shows the visible dichotomy between two resonant fields below and above the anisotropy field and its motion as a function of the direction of the applied magnetic field. A low value of a damping factor of ∼4.7 – 6.1 × 10–4 is estimated for uniform excitation mode with an anisotropy field of 65 ± 2 Oe. Investigation of below and above anisotropy field-dependent magnetodynamics in the low-frequency mode can be useful in designing the YIG-based resonators, oscillators, filters, and magnonic devices.

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Local Excitation of Magnetostatic Modes in YIG

Cited by 8 publications

References 24 publications

Evidence for a Magnetic Seebeck Effect

Evidence for a Magnetic Seebeck Effect

Thermal spin torques in magnetic insulators

Magnetoimpedance of Epitaxial Y₃Fe₅O₁₂ (001) Thin Film in Low-Frequency Regime

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Local Excitation of Magnetostatic Modes in YIG

Cited by 8 publications

References 24 publications

Evidence for a Magnetic Seebeck Effect

Evidence for a Magnetic Seebeck Effect

Thermal spin torques in magnetic insulators

Magnetoimpedance of Epitaxial Y3Fe5O12 (001) Thin Film in Low-Frequency Regime

Contact Info

Product

Resources

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Magnetoimpedance of Epitaxial Y₃Fe₅O₁₂ (001) Thin Film in Low-Frequency Regime