A. Kirilyuk
Radboud University Nijmegen
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Featured researches published by A. Kirilyuk.
Applied Physics Letters | 1997
V. Kirilyuk; A. Kirilyuk; T.H.M. Rasing
New possibilities for magnetic domain studies are demonstrated using a combination of nonlinear magneto-optical microscopy and a conventional linear polarizing microscope. The use of an optical response that is governed by a higher rank tensor offers sensitivity to additional combinations of magnetization directions and optical wave vector and polarization, which is demonstrated in magnetic garnet films of different crystallographic orientations. We observed a nontrivial modulated domain structure in a (210) film and a clear domain contrast for a (111) film, where the linear image only indicated simple up–down domains and no domain contrast for these two situations, respectively.
New Journal of Physics | 2008
Gregory A. Wurtz; William Hendren; Robert Pollard; R. Atkinson; L. Le Guyader; A. Kirilyuk; T.H.M. Rasing; Igor I. Smolyaninov; Anatoly V. Zayats
The magneto-optical properties of surface-plasmon polaritonic crystals on ferromagnetic substrates have been studied. The resonant optical transmission of such magneto-plasmonic nanostructures can be efficiently controlled with the applied static magnetic field. The effect is explained by the influence of magneto-optical effects on surface-plasmon polariton waves supported by the metal/magnetic-dielectric interface and, in particular, on the plasmonic bandgap formation.
Nature | 2017
A. Stupakiewicz; K. Szerenos; D. Afanasiev; A. Kirilyuk; A.V. Kimel
Discovering ways to control the magnetic state of media with the lowest possible production of heat and at the fastest possible speeds is important in the study of fundamental magnetism, with clear practical potential. In metals, it is possible to switch the magnetization between two stable states (and thus to record magnetic bits) using femtosecond circularly polarized laser pulses. However, the switching mechanisms in these materials are directly related to laser-induced heating close to the Curie temperature. Although several possible routes for achieving all-optical switching in magnetic dielectrics have been discussed, no recording has hitherto been demonstrated. Here we describe ultrafast all-optical photo-magnetic recording in transparent films of the dielectric cobalt-substituted garnet. A single linearly polarized femtosecond laser pulse resonantly pumps specific d−d transitions in the cobalt ions, breaking the degeneracy between metastable magnetic states. By changing the polarization of the laser pulse, we deterministically steer the net magnetization in the garnet, thus writing ‘0’ and ‘1’ magnetic bits at will. This mechanism outperforms existing alternatives in terms of the speed of the write–read magnetic recording event (less than 20 picoseconds) and the unprecedentedly low heat load (less than 6 joules per cubic centimetre).
Nature Communications | 2015
L. Le Guyader; M. Savoini; S. El Moussaoui; M. Buzzi; A. Tsukamoto; A. Itoh; A. Kirilyuk; T.H.M. Rasing; A.V. Kimel; F. Nolting
Ultrafast magnetization reversal driven by femtosecond laser pulses has been shown to be a promising way to write information. Seeking to improve the recording density has raised intriguing fundamental questions about the feasibility of combining ultrafast temporal resolution with sub-wavelength spatial resolution for magnetic recording. Here we report on the experimental demonstration of nanoscale sub-100 ps all-optical magnetization switching, providing a path to sub-wavelength magnetic recording. Using computational methods, we reveal the feasibility of nanoscale magnetic switching even for an unfocused laser pulse. This effect is achieved by structuring the sample such that the laser pulse, via both refraction and interference, focuses onto a localized region of the structure, the position of which can be controlled by the structural design. Time-resolved photo-emission electron microscopy studies reveal that nanoscale magnetic switching employing such focusing can be pushed to the sub-100 ps regime.Abstract The recently discovered magnetization reversal driven solely by a femtosecond laser pulse hasbeen shown to be a promising way to record information at record breaking speeds. Seeking toimprove the recording density has raised intriguing fundamental question about the feasibility tocombine the ultrafast temporal with sub-wavelength spatial resolution of magnetic recording. Herewe report about the rst experimental demonstration of sub-di raction and sub-100 ps all-opticalmagnetic switching. Using computational methods we reveal the feasibility of sub-di raction mag-netic switching even for an unfocused incoming laser pulse. This e ect is achieved via structuringthe sample such that the laser pulse experiences a passive wavefront shaping as it couples andpropagates inside the magnetic structure. Time-resolved studies with the help of photo-emissionelectron microscopy clearly reveal that the sub-wavelength switching with the help of the passivewave-front shaping can be pushed into sub-100 ps regime.
Applied Physics Letters | 1998
A. Kirilyuk; T.H.M. Rasing; M.A.M. Haast; J.C. Lodder
Magnetic CoNi/Pt interfaces are studied as a function of their preparation conditions by magnetization-induced second-harmonic generation (MSHG) measurements. A detailed method has been developed to decompose the total MSHG response into magnetic and crystallographic contributions for each interface. Although the bulk magnetism of the CoNi film (3 nm thick) shows only a subtle dependence on the sputtering Ar pressure, the interfaces appear to be dramatically affected. It can be shown that the crystallographic part probes the increase in the interface roughness while the magnetic one clearly reveals a maximum in the in-plane magnetization of the interface.
Applied Physics Letters | 2008
V. V. Pavlov; P. A. Usachev; R. V. Pisarev; D. A. Kurdyukov; S. F. Kaplan; A.V. Kimel; A. Kirilyuk; T.H.M. Rasing
Three-dimensional magnetic photonic crystals, based on an artificial opal matrix with embedded magnetite Fe3O4, were investigated in both transmission and reflection in the near-infrared and visible spectral range. A strong enhancement of the polar Kerr effect and a modification of the Faraday effect have been found near the photonic band gap at about 1.8 eV. Surprisingly the shapes of the loops of magnetic hysteresis measured by magnetic circular dichroism were found to depend on the wavelength of light. This observation has been explained using a model where two types of magnetite particles have different coercive fields.
Jetp Letters | 2005
A.M. Kalashnikova; R. V. Pisarev; L. N. Bezmaternykh; V. L. Temerov; A. Kirilyuk; T.H.M. Rasing
Single crystals of a noncentrosymmetric orthorhombic pyroelectric ferrimagnet Ga2−xFexO3 with a Curie temperature within 260–345 K have been grown by the flux method. It has been found that the electrical properties of the single crystals varied over a broad range from 105 to 1013 Ω cm depending on the presence of transitionmetal oxide impurities. The dispersion relations for all three principal dielectric functions of orthorhombic GaFeO3 have been determined in the range 0.7–5.4 eV by spectroscopic ellipsometry. The spectra of the dielectric functions of the orthorhombic Ga2−xFexO3 crystals are compared with the spectra of the trigonal crystals. The Faraday effect and second-harmonic generation are studied, and the law of the transition to the paramagnetic state has been determined. The crystallographic and magnetic contributions to the second-harmonic generation are analyzed.
Journal of Applied Physics | 2002
A. Kirilyuk; T.H.M. Rasing; H. Jaffrès; D. Lacour; F. Nguyen Van Dau
The magnetization reversal of an exchange-biased Co/NiO layer is studied with the help of magneto-optical microscopy, as a function of the angle between the applied magnetic field and the biasing direction. Based on domain patterns, a model of the magnetization reversal in these layers is presented. The drastic changes in the domain patterns indicate different domain nucleation conditions for different directions of the effective field.
Journal of Applied Physics | 2014
J. Kisielewski; W. Dobrogowski; Z. Kurant; A. Stupakiewicz; M. Tekielak; A. Kirilyuk; A.V. Kimel; T.H.M. Rasing; L.T. Baczewski; A. Wawro; K. Balin; J. Szade; A. Maziewski
Annealing ultrathin Pt/Co/Pt films with single femtosecond laser pulses leads to irreversible spin-reorientation transitions and an amplification of the magneto-optical Kerr rotation. The effect was studied as a function of the Co thickness and the pulse fluence, revealing two-dimensional diagrams of magnetic properties. While increasing the fluence, the creation of two branches of the out-of-plane magnetization state was found.
Nature Materials | 2014
A.R. Khorsand; M. Savoini; A. Kirilyuk; T.H.M. Rasing
To the Editor — Ultrafast laser-induced demagnetization is often ascribed to the absorption of light by electrons in the magnetic medium, with subsequent redistribution of energy and angular momentum1. Recently, an alternative mechanism was introduced, namely, a superdiffusive spin transport between adjacent layers2. Eschenlohr et al. claim to validate this mechanism1. In an optically excited Au/Ni layered structure, they found that the demagnetization of Ni can be up to 80%. It was calculated that light absorption in the magnetic layer is negligible compared with the absorption in the gold capping layer. Thus they conclude: “In strong contrast to existing knowledge we find that direct optical excitation is not a precondition for ultrafast demagnetization”. Knowledge of the exact absorption profile of light in multilayered thin films is crucial to disentangle thermal and non-thermal phenomena, such as in ref. 1. In this Correspondence, a comprehensive approach is given for absorption profile calculations for multilayer structures. In particular, we show that a crucial error was made in the calculations in ref. 1, which led to a misinterpretation of the experimental results, and a conclusion that cannot be substantiated with the presented experiment. The light intensity I(z) at position z in a material is defined by the Poynting vector (equation 24 in ref. 3), and is given by