Anisotropic magnetization-induced second harmonic generation in Fe/Au superlattices

Sato, K.; Kodama, A.; Miyamoto, Masatoshi; Петухов, А.В.; Takanashi, Kōki; Mitani, Seiji; Fujimori, H.; Kirilyuk, Andrei; Rasing, T.H.M.

doi:10.1103/physrevb.64.184427

Cited by 38 publications

(26 citation statements)

References 27 publications

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“…This allows for both the eee and eem SHG signals discussed above. Although it might seem unusual to have interference between a bulk eeq signal and a magnetic surface eee/eem signal, this has been observed in Fe/Au superlattices [42], with the origin of the interference attributed to the complex nature of the energy denominator as we discussed above. This seems to us a realistic possibility, and could be tested experimentally.…”

Section: B Shg Symmetry Analysis Applied To Sr2iro4mentioning

confidence: 97%

Magnetic ground state ofSr2IrO4and implications for second-harmonic generation

Matteo¹,

Norman²

2016

Phys. Rev. B

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The currently accepted magnetic ground state of Sr2IrO4 (the − + +− state) preserves inversion symmetry. This is at odds, though, with recent experiments that indicate a magnetoelectric ground state, leading to the speculation that orbital currents or more exotic magnetic multipoles might exist in this material. Here, we analyze various magnetic configurations and demonstrate that two of them, the magnetoelectric − + −+ state and the non-magnetoelectric + + ++ state, can explain these recent second-harmonic generation (SHG) experiments, obviating the need to invoke orbital currents. The SHG-probed magnetic order parameter has the symmetry of a parity-breaking multipole in the −+−+ state and of a parity-preserving multipole in the ++++ state. We speculate that either might have been created by the laser pump used in the experiments. An alternative is that the observed magnetic SHG signal is a surface effect. We suggest experiments that could be performed to test these various possibilities, and also address the important issue of the suppression of the RXS intensity at the L2 edge.

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Section: B Shg Symmetry Analysis Applied To Sr2iro4mentioning

confidence: 97%

Magnetic ground state ofSr2IrO4and implications for second-harmonic generation

Matteo¹,

Norman²

2016

Phys. Rev. B

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“…The description might also be improved, if quadrupole contributions to the SHG intensity would also be included into our model. 63,64 Two other mechanisms possibly giving rise to the discrepancies may be considered in the following. The first of them FIG.…”

Section: Limitations Of the Model Approachmentioning

confidence: 99%

Interfacial magnetization in exchange-coupledFe∕Cr∕Festructures investigated by second harmonic generation

et al. 2007

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We have studied the magnetic field dependences of magnetic optical second harmonic generation ͑SHG͒ in MBE-grown Fe/ Cr/ Fe/ Ag/ GaAs͑100͒ heterostructures displaying both bilinear and biquadratic interlayer exchange coupling. The magnetic field H was applied in the ͑100͒ surface plane along both easy ͓͑001͔͒ and hard ͓͑110͔͒ axes of the in-plane fourfold magnetic anisotropy. The SHG has been measured in reflection at near normal incidence for different polarization combinations ͑pp , ps , ss , sp͒ of the fundamental and second harmonic light in longitudinal and transversal geometries. The magnetic field variation of the SHG signal clearly reflects the field-induced transformations of the magnetic state at the interfaces in the trilayer. It strongly depends on the configuration of light polarization, experimental geometry ͑longitudinal or transversal͒, and orientation of the magnetic field H relative to the crystal axes. In contrast to linear magneto-optical Kerr effect, which is odd in magnetic field, magnetic SHG is either even in H or does not display a definite parity at all, depending on the polarization configuration. We interpret the data based on a model accounting for nonmagnetic and magnetic contributions to SHG from the surface and interfaces described by C 4v point symmetry. Taking into account the changes of the mutual orientation of interfacial magnetizations allows us to describe the general features of the measured field dependences of SHG.

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“…(13) by the simple permutation symmetry Xijkl == xikjl are omitted. From the above it is straightforward to derive 45 that the azimuthal dependence of the response has the form…”

Section: Pf'q(2w) ~ Ljsejtr(w)veitr(w)mentioning

confidence: 99%

“…45 The crystallographic electricdipole contribution from such structure with fourfold symmetry (that corresponds to the 4/mmm point-group symmetry) is described by a third-rank tensor and is therefore isotropic. On the other hand, both magnetic electric-dipole and crystallographic electric-quadrupole terms give an anisotropic response, indicating the presence of higher-order contributions.…”

Section: Calculation Of Mshg From Multilayersmentioning

confidence: 99%

Magnetization-induced-second-harmonic generation from surfaces and interfaces

2005

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Magnetization-induced effe_ct.s in the nonlinear optical response of magnetic media, such as magnetizationinduced-second-harmonic generation (MSHG), led to very strong and novel non linear magneto-optical effects that appear to be very sensitive to magnetic interface properties. This surface-interface sensitivity ofMSHG, in combination with the very large magneto-optical effects, has led to a fast development of this technique over the past decade. On the one hand, an extreme sensitivity of MSHG to the electronic and magnetic structure of clean surfaces has been successfully demonstrated. On the other hand, the penetration depth of light allows one to use this sensitivity to study buried interfaces in multilayer systems. Further experimental developments of the MSHG technique, such as space and time t·esolution as well as magnetization-sensitive-sumfrequency generation, appear to be promising as well.

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Anisotropic magnetization-induced second harmonic generation in Fe/Au superlattices

Cited by 38 publications

References 27 publications

Magnetic ground state ofSr2IrO4and implications for second-harmonic generation

Magnetic ground state ofSr2IrO4and implications for second-harmonic generation

Interfacial magnetization in exchange-coupledFe∕Cr∕Festructures investigated by second harmonic generation

Magnetization-induced-second-harmonic generation from surfaces and interfaces

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