Magnetization-induced second-harmonic generation of light by exchange-coupled magnetic layers

Sampaio, Luiz C.; Hamrle, Jaroslav; Павлов, В. В.; Ferré, J.; Georges, Patrick; Brun, Alain; Youssef, J. Ben

doi:10.1364/josab.22.000119

Cited by 8 publications

(6 citation statements)

References 27 publications

(53 reference statements)

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“…Since the theoretical predictions in the 1980's [20][21][22][23] and subsequent first experimental observations [24][25][26][27] the method has been widely used and proved to be a highly sensitive tool to investigate surface and interfacial magnetic properties of thin films and multilayers. [28][29][30][31][32] The first theoretical activities 22,23 were devoted to the treatment of MSHG ͑or nonlinear Kerr effect͒ from infinitely thin magnetic layers, where the electro-dipole SHG appears due to the breaking of the inversion symmetry at the surface or interface. The phenomenological model describing MSHG in magnetic multilayers formed by sequence of magnetic and nonmagnetic centrosymmetric thin films was elaborated in Refs.…”

Section: Introductionmentioning

confidence: 99%

“…IV. For the modeling of the data we used the results of previous theoretical treatments, 32,38,39,55,56 taking into account that the angle of incidence in our measurements was close to normal incidence ͑ Ϸ 5°͒. This allowed us to simplify expressions and to link the values of MSHG in different polarization and magnetic field configurations to certain components of the magnetization vector.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2007

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“…Here, the magnetic field breaks the time-inversion symmetry and leads to different footprints in the SHG signal, allowing one to probe the spin of an electron rather than the charge. In general, three types of MFISH are distinguished: (i) When magnetic field is inserted externally on disordered materials or sublattices in a perturbative way, it results in previously undetected SHG signatures; at a fixed frequency, Si is known to iterate a weak surface-induced MFISH signal. ,, (ii) SHG components are introduced below the phase transitions temperature for magnetically ordered materials; AFM SHG in the spin-flop Cr 2 O 3 serves an example . (iii) In magnetic materials, the existing magnetic field below the transition temperature increases the strength of the SHG signal by creating a single domain state with maximum magnetization; SHG contributions are not induced in this case. , …”

Section: Detection Of Magnetic Ordering/characterizationmentioning

confidence: 99%

“…156 (iii) In magnetic materials, the existing magnetic field below the transition temperature increases the strength of the SHG signal by creating a single domain state with maximum magnetization; SHG contributions are not induced in this case. 155,157 Evidence of AFM SHG. The quest for probing magnetic ordering by SHG dates back several decades, 146 but recent experimental demonstrations provide a promising future and platform to explore second-order non-linear optical effects.…”

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confidence: 99%

Recent Developments in van der Waals Antiferromagnetic 2D Materials: Synthesis, Characterization, and Device Implementation

et al. 2021

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Magnetism in two dimensions is one of the most intriguing and alluring phenomena in condensed matter physics. Atomically thin 2D materials have emerged as a promising platform for exploring magnetic properties, leading to the development of essential technologies such as supercomputing and data storage. Arising from spin and charge dynamics in elementary particles, magnetism has also unraveled promising advances in spintronic devices and spin-dependent optoelectronics and photonics. Recently, antiferromagnetism in 2D materials has received extensive attention, leading to significant advances in their understanding and emerging applications; such materials have zero net magnetic moment yet are internally magnetic. Several theoretical and experimental approaches have been proposed to probe, characterize, and modulate the magnetic states efficiently in such systems. This Review presents the latest developments and current status for tuning the magnetic properties in distinct 2D van der Waals antiferromagnets. Various state-of-the-art optical techniques deployed to investigate magnetic textures and dynamics are discussed. Furthermore, device concepts based on antiferromagnetic spintronics are scrutinized. We conclude with remarks on related challenges and technological outlook in this rapidly expanding field.

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“…The formalism is based on phenomenological expressions of the nonlinear response from the single surface or interface of C 4v symmetry. [25][26][27][28][29][30] As shown in Ref. 9, these expressions can also be used to describe the nonlinear response of the system with several interfaces-provided that all of them have the same C 4v symmetry.…”

Section: A Mshg Approachmentioning

confidence: 99%

Domain structure in biaxial Fe/Cr films induced by lateral fluctuations of the magnetic anisotropy

et al. 2008

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The magnetic microstructure of single-crystalline Fe͑001͒ thin films has been studied by magnetic second harmonic generation and conventional magneto-optical Kerr effect methods. The layers were grown on GaAs/Fe/Ag͑100͒ substrates, capped by a Cr overlayer, and displayed a fourfold in-plane magnetic anisotropy. We observe the formation of a multidomain structure at magnetic fields ͉H͉ Յ 0.5 kOe, when the field is applied in a narrow range of azimuthal angles close to the hard axis direction ͉͑⌬͉ Ͻ 1°͒. The domains are characterized by the same longitudinal magnetization component M x and transverse components M y of opposite signs. We developed an approach to extract the change of the relative contributions of domains with different magnetization directions during magnetization reversal from the experimental data. The formation of a domain structure can be explained by taking into account the lateral fluctuations of the magnetic anisotropy energy caused by defects and stress at the interfaces and the role of the biquadratic exchange coupling between interfacial Fe and Cr magnetic moments.

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Magnetization-induced second-harmonic generation of light by exchange-coupled magnetic layers

Cited by 8 publications

References 27 publications

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

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

Recent Developments in van der Waals Antiferromagnetic 2D Materials: Synthesis, Characterization, and Device Implementation

Domain structure in biaxial Fe/Cr films induced by lateral fluctuations of the magnetic anisotropy

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