Analytical expression of the magneto-optical Kerr effect and Brillouin light scattering intensity arising from dynamic magnetization

Hamrle, Jaroslav; Pištora, Jaromı́r; Hillebrands, B.; Lenk, Benjamin; Münzenberg, Markus

doi:10.1088/0022-3727/43/32/325004

Cited by 24 publications

(14 citation statements)

References 33 publications

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“…Figure 5 illustrates the calculated specific MOKE rotation and ellipticity for the 15 nm-thick Fe films. The data were calculated using the layer-by-layer approach based on the medium boundary and propagation matrices [2][3][4][5] for the p-polarized incident beam.…”

Section: Supplementary Note 2: Moke In-depth Sensitivitymentioning

confidence: 99%

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Nanoscale interface confinement of ultrafast spin transfer torque driving non-uniform spin dynamics

et al. 2017

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Spintronics had a widespread impact over the past decades due to transferring information by spin rather than electric currents. Its further development requires miniaturization and reduction of characteristic timescales of spin dynamics combining the sub-nanometre spatial and femtosecond temporal ranges. These demands shift the focus of interest towards the fundamental open question of the interaction of femtosecond spin current (SC) pulses with a ferromagnet (FM). The spatio-temporal properties of the impulsive spin transfer torque exerted by ultrashort SC pulses on the FM open the time domain for probing non-uniform magnetization dynamics. Here we employ laser-generated ultrashort SC pulses for driving ultrafast spin dynamics in FM and analysing its transient local source. Transverse spins injected into FM excite inhomogeneous high-frequency spin dynamics up to 0.6 THz, indicating that the perturbation of the FM magnetization is confined to 2 nm.

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Section: Supplementary Note 2: Moke In-depth Sensitivitymentioning

confidence: 99%

“…

Spintronics had a widespread impact over the past decades due to transferring information by spin rather than electric currents [1][2][3][4][5][6]. Its further development requires miniaturization and reduction of characteristic timescales of spin dynamics combining the sub-nanometer spatial and femtosecond temporal ranges [7].

…”

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confidence: 99%

Nanoscale interface confinement of ultrafast spin transfer torque driving non-uniform spin dynamics

et al. 2017

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“…This technique combines photo and spin-wave excitation, hence the 720 term photo-magnonics. A recent work by Hamrle showed that both optical techniques, BLS and TRMOKE are comparable in their sensitivity [64].…”

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confidence: 99%

The building blocks of magnonics

et al. 2011

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Novel material properties can be realized by designing waves' dispersion relations in artificial crystals. The crystal's structural length scales may range from nano- (light) up to centimeters (sound waves). Because of their emergent properties these materials are called metamaterials. Different to photonics, where the dielectric constant dominantly determines the index of refraction, in a ferromagnet the spin-wave index of refraction can be dramatically changed already by the magnetization direction. This allows a different flexibility in realizing dynamic wave guides or spin-wave switches. The present review will give an introduction into the novel functionalities of spin-wave devices, concepts for spin-wave based computing and magnonic crystals. The parameters of the magnetic metamaterials are adjusted to the spin-wave k-vector such that the magnonic band structure is designed. However, already the elementary building block of an antidot lattice, the singular hole, owns a strongly varying internal potential determined by its magnetic dipole field and a localization of spin-wave modes. Photo-magnonics reveal a way to investigate the control over the interplay between localization and delocalization of the spin-wave modes using femtosecond lasers, which is a major focus of this review. We will discuss the crucial parameters to realize free Bloch states and how, by contrast, a controlled localization might allow to gradually turn on and manipulate spin-wave interactions in spin-wave based devices in the future.Comment: 48 pages; 33 figure

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“…In order to optimize the optical detection either for magneto-optical imaging or in time-resolved experiments, it is important to determine the wavelength dependence of the MOKE. However, the MOKE is also dependent on the layer thickness, the layer and substrate indices, all the more in weakly absorbing magnetic materials as semiconductors or insulators [21][22][23][24]. It is therefore of prime importance to retrieve the intrinsic magneto-optical parameters, depending only on the bulk material structure.…”

Section: Introductionmentioning

confidence: 99%

Magneto-optical Kerr spectroscopy in ferromagnetic semiconductors: determination of the intrinsic complex magneto-optical Voigt constant

Riahi

Maaref

Lemaı̂tre

et al. 2018

Semicond. Sci. Technol.

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Thin films of ferromagnetic semiconductors of the (Ga, Mn)(As, P) family are investigated by means of magneto-optical Kerr spectroscopy in order to determine the spectral dependence of the complex magneto-optical Voigt constant Q, an intrinsic parameter responsible for Kerr rotation and ellipticity. We obtain the spectral dependence of these two conjugate quantities: the Kerr rotation and ellipticity angles. Contrary to strongly absorbing metallic ferromagnetic layers, it is expected that they vary non-linearly with the layer thickness at a fixed wavelength, as a consequence of the weak absorption and the non-negligible optical phase shift in weakly absorbing semiconductor ferromagnets. We show that, from the Kerr rotation and ellipticity angles and the complex refractive index-obtained by ellipsometric measurements-we are able to determine the spectral dependence of the complex intrinsic Voigt constant, thus avoiding the need for samples with different thicknesses. Incidentally, the use of phosphorus substituted (Ga, Mn)As provides an out-of-plane magnetic easy axis, the appropriate configuration for polar magneto-optical Kerr effect, without the need for a strong external magnetic field.

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Analytical expression of the magneto-optical Kerr effect and Brillouin light scattering intensity arising from dynamic magnetization

Cited by 24 publications

References 33 publications

Nanoscale interface confinement of ultrafast spin transfer torque driving non-uniform spin dynamics

Nanoscale interface confinement of ultrafast spin transfer torque driving non-uniform spin dynamics

The building blocks of magnonics

Magneto-optical Kerr spectroscopy in ferromagnetic semiconductors: determination of the intrinsic complex magneto-optical Voigt constant

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