Interaction between Light Waves and Spin Waves

Shen, Y. R.; Bloembergen, N.

doi:10.1103/physrev.143.372

Cited by 137 publications

(73 citation statements)

References 30 publications

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“…The explicit expression for this process can be derived by extending the theory for the interaction between light waves and spin waves in ref. 30. An additional MD-type matrix element has to be added to the excitation process in ref.…”

Section: Resultsmentioning

confidence: 99%

Ultrafast optical tuning of ferromagnetism via the carrier density

et al. 2015

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Interest in manipulating the magnetic order by ultrashort laser pulses has thrived since it was observed that such pulses can be used to alter the magnetization on a sub-picosecond timescale. Usually this involves demagnetization by laser heating or, in rare cases, a transient increase of magnetization. Here we demonstrate a mechanism that allows the magnetic order of a material to be enhanced or attenuated at will. This is possible in systems simultaneously possessing a low, tunable density of conduction band carriers and a high density of magnetic moments. In such systems, the thermalization time can be set such that adiabatic processes dominate the photoinduced change of the magnetic order-the three-temperature model for interacting thermalized electron, spin and lattice reservoirs is bypassed. In ferromagnetic Eu 1 À x Gd x O, we thereby demonstrate the strengthening as well as the weakening of the magnetic order by B10% and within r3 ps by optically controlling the magnetic exchange interaction.

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Section: Resultsmentioning

confidence: 99%

Ultrafast optical tuning of ferromagnetism via the carrier density

et al. 2015

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“…In 1961, Pitaevski [1], Shen and Bloembergen [2], and others [3] described theoretically how a static magnetization could be generated by an "effectively magnetic" interaction proportional to Ē ͑͒ ϫ Ē *͑−͒ in the case of circularly polarized fields. Since that time, several groups have ascribed strong optically induced magnetization effects and ultrafast manipulation of static magnetizations with light to nonlinear, difference frequency interactions.…”

Section: Introductionmentioning

confidence: 99%

Optically induced magnetization in homogeneous, undoped dielectric media

2008

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A widely held viewpoint in optics, namely, that dynamic magnetic effects are extremely weak at optical frequencies, is re-examined. Nonlinear charge motion induced by the optical magnetic field in dielectric systems is analyzed, is predicted to be resonantly enhanced, and is observed experimentally in CCl 4 , C 6 H 6 , and H 2 O at the fundamental input frequency. Excellent agreement is obtained with a classical magnetic harmonic oscillator model, which shows that the maximum dynamic magnetic dipole (MD) moment at optical frequencies is one half the electric dipole (ED) moment. As a consequence, magnetic dipole radiation generated by the optical magnetic field with an intensity one fourth that of ED radiation, as well as unanticipated nonlinear optical effects such as magnetic white-light generation, can arise in homogeneous transparent dielectrics. The mechanism of MD formation is confirmed experimentally to be second order in the input field, and the strength of the radiation is accounted for as a first-order contribution to the vector potential. Predictions are made of optical magnetic resonance, negative permeability, self-induced magnetic birefringence, and optically induced Faraday rotation.

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“…Therefore, we should consider an alternative mechanism of the coherent magnon excitation that does not rely on absorption as the photon energy is well below the absorption edge. Such a mechanism can be impulsive first order stimulated Raman scattering [12,13], described here in terms of the equation of motion for the normal coordinate Q t of the spin wave. The efficiency of such an approach has been demonstrated for the optical excitation of coherent phonons [13][14][15].…”

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confidence: 99%

Impulsive Generation of Coherent Magnons by Linearly Polarized Light in the Easy-Plane AntiferromagnetFeBO3

et al. 2007

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Polarization-dependent excitation of coherent spin precession by 150 fs linearly polarized laser pulses is observed in the easy-plane antiferromagnet FeBO 3 . We show that the mechanism of excitation is impulsive stimulated Raman scattering. This process is shown to be determined not only by the magnetooptical constants of the material, but also by the properties of the spin precession itself. Though carrying no angular momentum, the linearly polarized laser pulses act on the spins as effective fields that can be considered as an ultrafast inverse Cotton-Mouton effect.

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Interaction between Light Waves and Spin Waves

Cited by 137 publications

References 30 publications

Ultrafast optical tuning of ferromagnetism via the carrier density

Ultrafast optical tuning of ferromagnetism via the carrier density

Optically induced magnetization in homogeneous, undoped dielectric media

Impulsive Generation of Coherent Magnons by Linearly Polarized Light in the Easy-Plane AntiferromagnetFeBO3

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