Photomagnetization of Ferrite Films and Its Effect on Optical Spectra

Katsnelson, E. Z.; Кароза, А. Г.; Chervinskii, M. M.

doi:10.1002/pssa.2211110257

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…The films were deposited onto a freshly cleaved (1 0 0) MgO substrate (10.3 Â 6.4 mm 2 ) using a chemical transport reaction [24]. The X-ray diffraction analysis showed that the film is a uniphase monocrystalline film oriented in a (1 0 0) plane with a lattice parameter a ¼ 8.443 Å .…”

Section: Methodsmentioning

confidence: 99%

Photo-induced bias of the hysteresis loop in ferrites at room temperature with long-time memory

Katsnelson

Chervinsky

2009

Journal of Magnetism and Magnetic Materials

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Section: Methodsmentioning

confidence: 99%

Photo-induced bias of the hysteresis loop in ferrites at room temperature with long-time memory

Katsnelson

Chervinsky

2009

Journal of Magnetism and Magnetic Materials

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“…The take-off angle was u 20 ± . The Ni ferrite sample was an epitaxially grown crystalline 3 micron film prepared on a MgO single crystal [15]. The Co sample was evaporated ex situ ͑2000 Å͒ on as grown Si wafer and capped with 20 Å Au; the effect of a possible thin silicide at the Si-Co interface is negligible.…”

Section: (Received 22 April 1998)mentioning

confidence: 99%

Magnetic Circular Dichroism in Resonant Raman Scattering in the Perpendicular Geometry at theLedge of3dTransition Metal Systems

et al. 1999

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We measured circular dichroism in resonant x-ray scattering 3d n ! 2p 5 3d n11 ! 3s 1 3d n11 with incidence perpendicular to the magnetization where the absorption dichroism vanishes. The advantages of photon scattering over other techniques make it possible to study a wide range of materials. The Ni L 3 dichroism in NiFe 2 O 4 is ͑28 6 5͒% in agreement with a localized model. In the metal Co the dichroism is reduced to ͑10.4 6 1͒% ͑L 3 ͒ and ͑6.8 6 1.5͒% (7.5 eV above L 3 ), indicating a large sensitivity to the nature of the valence states despite the fact that this spectroscopy is based on inner shell transitions. [S0031-9007(99)08431-8] PACS numbers: 78.70.En, 78.70.Ck, 78.70.Dm In recent years there has been a considerable effort in circular x-ray dichroism on magnetic materials [1], which provides important, and in many aspects unique, information especially by the use of the sum rules [2]. Much of this effort has been devoted to dichroism in x-ray absorption exploiting the difference in the number of the created core holes for parallel and antiparallel alignment of the magnetization and helicity vector of the incident light. The charge distribution of the excited core hole is not only characterized by its integral which is proportional to the absorption but also by its spatial distribution which is in general not spherical. Information on the deviation from the spherical symmetry, i.e., on the core hole polarization can be obtained from the angular dependence of the particles emitted by the decay of the core hole [3,4]. Since this deviation is directly connected to the ground state properties by the optical transition matrix elements of the absorption process, important information about the material properties is laying dormant in the angular emission when only absorption is measured. The dichroism in absorption vanishes when the incident light is perpendicular to the magnetization, i.e., in the socalled "forbidden" geometry. Let us consider the plane defined by the incident beam and by the emitted products detected in the experiment, with the magnetization in this plane (coplanar perpendicular geometry hereafter referred to as "perpendicular"). The detection breaks the mirror symmetry of the system, and one obtains information on the nonspherical part of the core hole distribution. So far this approach has been used only in experiments based on electron emission [3,5]. The possibility of detecting emitted photons has never been explored. The aim of the present Letter is not only to show that this is feasible but to present original results in this field. We concentrate on 3d TM systems, and we use the inner shell excitation of the type 3d n ! 2p 5 3d n11 ! 3s 1 3d n11 (i.e., final state with a 3s hole due to the filling of the intermediate 2p core hole state) which is an example of resonant Raman scattering (RRS). In Ni the L 3 excitation is around 853 eV and the Raman photons are around 742 eV; in the metal Co the energies are 778 and 677 eV, respectively. Perpendicular RRS (PRRS) has the potential t...

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Optically induced variation of magnetic and photoelectric properties of ferrites

Katsnelson

1991

Journal of Applied Physics

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The laser irradiation of ferrites in a dc magnetic field at room temperature leads to a significant change of their residual magnetization and photovoltaic response, both in magnitude and the symmetry with respect to a magnetic field. The photovoltage also acquires a nonlinear field dependence. The variation in the properties is retained by the samples for a long time. This lifetime strongly depends on the wavelength of the laser light. Photoinduced effects are connected with photomagnetization (PM) which arises during irradiation. The PM was directly measured with a magnetometer on single crystal Mn1−xZnxFe2O4 ferrites (bulk) with x=0.09 (1) and 0.56 (2) as well as on MeFe2O4 ferrite films with Me=Mn (3), Ni (4), and Co (5). The effect might be useful for optical recording.

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Photomagnetization of Ferrite Films and Its Effect on Optical Spectra

Cited by 4 publications

References 4 publications

Photo-induced bias of the hysteresis loop in ferrites at room temperature with long-time memory

Photo-induced bias of the hysteresis loop in ferrites at room temperature with long-time memory

Magnetic Circular Dichroism in Resonant Raman Scattering in the Perpendicular Geometry at theLedge of3dTransition Metal Systems

Optically induced variation of magnetic and photoelectric properties of ferrites

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