Structure and optical properties of Ag/CeO2 nanocomposites

Liu, I-Tsan; Hon, Min–Hsiung; Kuan, Chi-Yun; Teoh, Lay-Gaik

doi:10.1007/s00339-012-7339-y

Cited by 17 publications

(8 citation statements)

References 25 publications

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“…The SO interaction in YIG was previously considered to be extremely small due to an assumption that λ SO = λ c (the reduced Compton wavelength). A recent theoretical study predicts that the SO interaction can be orders of magnitude larger in YIG if one considers orbital hybridization, which yields λ SO ≫ λ c [31,32]. Here we present experimental observation of this SO interaction in a single-crystal YIG thin film.…”

mentioning

confidence: 62%

“…We note that this value can be drastically enhanced by decreasing the wavelength. Especially, it is estimated that a π-phase shift can be achieved as the wavelength approaches the exchange limit [32]. The phase shift signal has a clear dependence on the electric field, demonstrating the electric tuning origin.…”

mentioning

confidence: 97%

“…In the AC effect picture, the SO interaction provides an electric-field-dependent term f = f M λk to the dispersion [32], where λ = 2Ja 5 eE/µ 0 E SO 2 γ 2 , with J being the exchange coefficient between neighboring lattices, a the lattice constant, e the elementary charge, and µ 0 the vacuum permeability. Since the magnetization of the YIG is not saturated under the applied magnetic field, J has a B dependence and accordingly λ can be expressed as λ = (λ 0 + λ B B)E, where λ 0 and λ B are constants determined through the experiments.…”

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confidence: 99%

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Electric-Field Coupling to Spin Waves in a Centrosymmetric Ferrite

et al. 2014

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We experimentally demonstrate that the spin-orbit interaction can be utilized for direct electric-field tuning of the propagation of spin waves in a single-crystal yttrium iron garnet magnonic waveguide. Magnetoelectric coupling not due to the spin-orbit interaction and, hence, an order of magnitude weaker leads to electric-field modification of the spin-wave velocity for waveguide geometries where the spin-orbit interaction will not contribute. A theory of the phase shift, validated by the experiment data, shows that, in the exchange spin wave regime, this electric tuning can have high efficiency. Our findings point to an important avenue for manipulating spin waves and developing electrically tunable magnonic devices.

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confidence: 62%

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confidence: 97%

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confidence: 99%

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Electric-Field Coupling to Spin Waves in a Centrosymmetric Ferrite

et al. 2014

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“…[9], under the assumption that the total spin along the z axis j S z j is conserved and remains a good quantum number, we have proposed a magnonic analog of the quantum spin Hall effect characterized by helical edge states and thus established a bosonic counterpart of TIs [44,45], namely the magnonic TIs in insulating AFs using the above-mentioned picture for the clean systems and following the work by Aharonov and Casher [13,46]. The proposal is built upon the fact that an electric field couples to the magnetic dipole moment σgµ B e z through the AC effect [13,[47][48][49][50][51][52][53][54][55], which is analogous to the Aharonov-Bohm (AB) effect [56][57][58] of electrically charged particles in magnetic fields. Each magnon (σ = ±1) of the insulating AF subjected to a dc electric field with E a constant gradient E(r) = E(−x, 0, 0) as a function of the position r = (x, y, 0) experiences the "electric" vector potential [9,14,49] A m (r) = E(r) × e z /c = E/c(0, x, 0).…”

Section: Magnonic Timentioning

confidence: 99%

Laser control of magnonic topological phases in antiferromagnets

2019

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We study the laser control of magnon topological phases induced by the Aharonov-Casher effect in insulating antiferromagnets (AFs). Since the laser electric field can be considered as a timeperiodic perturbation, we apply the Floquet theory and perform the inverse frequency expansion by focusing on the high frequency region. Using the obtained effective Floquet Hamiltonian, we study nonequilibrium magnon dynamics away from the adiabatic limit and its effect on topological phenomena. We show that a linearly polarized laser can generate helical edge magnon states and induce the magnonic spin Nernst effect, whereas a circularly polarized laser can generate chiral edge magnon states and induce the magnonic thermal Hall effect. In particular, in the latter, we find that the direction of the magnon chiral edge modes and the resulting thermal Hall effect can be controlled by the chirality of the circularly polarized laser through the change from the left-circular to the right-circular polarization. Our results thus provide a handle to control and design magnon topological properties in the insulating AF. arXiv:1907.07636v1 [cond-mat.mes-hall]

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“…The enhancement of the magnetoelectric effect in bismuth iron garnet with respect to yttrium iron garnet and the non-monotonic dependence of the ME coupling on the temperature raise additional questions about the mechanisms of magnetoelectric interaction in garnets. This enhanced ME effect is of great importance for the rapidly developing field of magnonic devices, where it can be used for highly desirable electrical tuning of spin waves [44,45].…”

Section: Samplementioning

confidence: 99%

Bismuth iron garnet Bi3Fe5O12: A room temperature magnetoelectric material

Popova

Shengelaya

Daraselia

et al. 2017

Applied Physics Letters

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The possibility to control the magnetic properties of a material with an electric field at room temperature is highly desirable for modern applications. Moreover, a coupling between magnetic and electric orders within a single material presenting a wide range of exceptional physical properties, such as bismuth iron garnet (BIG), may lead to great advances in the field of spintronic applications. In particular, the combination of the magnetoelectric (ME) coupling with the low damping of spin waves in BIG can allow the control and manipulation of spin waves by an electric field in magnonic devices. Here we report the unambiguous observation of linear magnetoelectric coupling above 300 K in BIG using ferromagnetic resonance technique with electric field modulation. The measured coupling value is comparable with that observed for prototypal magnetoelectric Cr2O3. On the basis of our experimental results, the strength of this linear ME coupling is directly linked to the presence of bismuth ions inducing strong spin orbit coupling and to the appearance of local magnetic inhomogeneities related to the magnetic domain structure. The unprecedented combination of magnetic, optical and magnetoelectrical properties in BIG is expected to trigger significant interest for technological applications as well as for theoretical studies.

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Structure and optical properties of Ag/CeO2 nanocomposites

Cited by 17 publications

References 25 publications

Electric-Field Coupling to Spin Waves in a Centrosymmetric Ferrite

Electric-Field Coupling to Spin Waves in a Centrosymmetric Ferrite

Laser control of magnonic topological phases in antiferromagnets

Bismuth iron garnet Bi3Fe5O12: A room temperature magnetoelectric material

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