Electron Spin Resonance Properties of Magnetic Granular GMI—Nanostructures in Millimeter Waveband

Tarapov, S. I.; Bagmut, T. V.; Granovsky, A.B.; Деркач, В. Н.; Nedukh, S. V.; Plevako, A.S.; Roschenko, S.T.; Shipkova, I. G.

doi:10.1023/b:ijim.0000047449.79715.66

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…From the ratio of disk diameter to distance between disks it follows that we have ensembles of almost noninteracting disks. The magnetoresonance experiments were performed at 70-80 GHz frequency band and at temperature T=4.2 K. The static external magnetic field was applied perpendicularly to the disks array [5].…”

Section: Technique and Methods Of Experimentsmentioning

confidence: 99%

Low Temperature FMR in the System of Non-Interacting Magnetic Nanodisks

Nedukh¹,

Tarapov²,

Belozorov³

et al. 2012

SSP

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Magnetodynamical properties of systems of magnetic nanodisks at the microwave range and low temperatures were studied experimentally. Several periodic square arrays of Permalloy nanodisks deposited onto a glass substrate have been studied. The interdisk center-to-center distance in each array was equal to double disk diameter . The magnetoresonance studies were performed at 70-80 GHz frequency band and at the temperature of 4.2 K. The static external magnetic field was applied perpendicularly to the disks array. As a result the magnetoresonance absorption spectra have been obtained, containing both fundamental mode and spin wave modes. A comparative analysis of the results is performed with the X-band results obtained at T = 300K.

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Section: Technique and Methods Of Experimentsmentioning

confidence: 99%

Low Temperature FMR in the System of Non-Interacting Magnetic Nanodisks

Nedukh¹,

Tarapov²,

Belozorov³

et al. 2012

SSP

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“…The frequency behaviour of the complex valued permeability follows from the macroscopic model of the medium based on the well-known Bloch motion equation, see for example [14,15]. In the so-called "slowly passing" resonance line approximation (i.e., for the stationary case) and for small amplitude of alternating field, the permeability of the paramagnetic material μ = μ + iμ can be presented in the following form [14,16]:…”

Section: Problem Formulationmentioning

confidence: 99%

Resonant Diffraction From a Grating on a Paramagnetic Layer With Frequency Dispersion

Panin¹,

Vinogradova²,

Poyedinchuk³

et al. 2009

PIER M

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Theoretical results on the plane electromagnetic wave diffraction from a structure as a strip periodic grating on a paramagnetic layer, the permeability of which possesses negative real part in the microwave band, are obtained using analytical regularization based on the solution to the Riemann-Hilbert problem. The effect of the resonant transmission accompanied by extremely high absorption is thoroughly studied across the frequency band of the surface waves of the paramagnetic layer placed in the biasing magnetic field. This effect is caused by the surface waves of the layer excited resonantly by the plane incident wave with the diffraction grating present. The resonant frequency is electronically tuned by the biasing magnetic field.

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“…2). This relation allows estimating a value of magnetization of saturation of specimens.For this a known Kittel formulas have been used [4]. We consider two situations below.…”

mentioning

confidence: 99%

“…We applied the ferromagnetic resonance (FMR) technique for experimental study of these structures in a wide frequency range -70-80 GHz, and at a temperature 4.2 K [4]. Two kinds of specimens were investigated: sintered bulk specimen (#1) and thin-films specimen (#2).…”

mentioning

confidence: 99%

Magnetoresonance features of strontium-doped lanthanum manganites-perovskites in microwave band

Nedukh

Girich

Kharchenko

et al. 2010

2010 International Kharkov Symposium on Physics and Engineering of Microwaves, Millimeter and Submillimeter Waves

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The strong interest to study microwave features of modem artificial materials occurs. One of prospective candidates for such a role are Sr-doped lanthanum manganites-perovskites. Due to special interparticles interactions in the perovskite lattice they show a number of unique properties, including in particular, the colossal magnetoresistance -CMR [1]. The essence of the CMR phenomenon consists in the abrupt increase of electric resistance under the impact of the external static magnetic field. Mainly due to this effect doped manganites are considered as promising materials for design of novel generation of magnetic sensors and devices of the magnetic information read-out, for novel generation of magnetically controlled microwave and terahertz devices [2]. On the other hand, lanthanum manganites are very interesting object as a model of so-called "left handed" media i.e. media which demonstrate the negativity of refraction coefficient [3].Thus a task of the interspin interactions research is of great importance both from the fundamental and technological points of view. We applied the ferromagnetic resonance (FMR) technique for experimental study of these structures in a wide frequency range -70-80 GHz, and at a temperature 4.2 K [4]. Two kinds of specimens were investigated: sintered bulk specimen (#1) and thin-films specimen (#2). The bulk specimen of lanthanum manganite La SrMn03 (L SMO) has a parallelepiped shape with dimensional 2.5x4 mm and thickness of 0.4 mm. Thin-films specimen of LSMO have been deposited on parallelepiped shape substrate with dimensional 7.2x3.4 mm and thickness of substrate 0.5 mm. The thickness of lanthanum manganite layer for thin-films specimen was 1000 A. Both of specimens has Curie Temperature Tc=350 K.We used the two-mirror opened resonator, consisting of flat and spherical mirrors (Fig. I) for experimental magnetoresonance researches in mm-waveband. Each mirror has a coupling slot, connected mirror with rectangular waveguides The diameter of mirrors 30 mm, distance between them about 5 mm. There are two "geometry" of experiment. If direction of external magnetic field directed parallel to the plane of specimen it is "parallel orientation" (Fig. la). If direction of external magnetic field is directed normally to the specimen plane it is "perpendicular orientation" (Fig. I b). The reference DPPH marker was located in the vicinity of the resonance field. caustic surface spherical mirror caustic surface C��Jl2flat mirror a) b) Figure 1. Two-mirror opened resonator and different "geometry" of magneto resonance experiments: a) parallel "geometry", b) perpendicular "geometry"Ferromagnetic resonance spectra (FMR spectra), obtained during experiment were processed and presented as the resonance frequency-field dependence (Fig. 2). This relation allows estimating a value of magnetization of saturation of specimens.For this a known Kittel formulas have been used [4]. We consider two situations below. First of them considers that some definite field of anisotropy Ha presents, which we sho...

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Electron Spin Resonance Properties of Magnetic Granular GMI—Nanostructures in Millimeter Waveband

Cited by 9 publications

References 2 publications

Low Temperature FMR in the System of Non-Interacting Magnetic Nanodisks

Low Temperature FMR in the System of Non-Interacting Magnetic Nanodisks

Resonant Diffraction From a Grating on a Paramagnetic Layer With Frequency Dispersion

Magnetoresonance features of strontium-doped lanthanum manganites-perovskites in microwave band

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