Broadband stripline ferromagnetic resonance spectroscopy of ferromagnetic films, multilayers and nanostructures

Maksymov, Ivan S.; Kostylev, Mikhail

doi:10.1016/j.physe.2014.12.027

Cited by 154 publications

(173 citation statements)

References 221 publications

(396 reference statements)

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“…The Green's function ( , ', , ') e G y y x x is obtained from (17,23) by considering the electric field of dynamic magnetisation at the point (y,x) of the strip cross-section, provided that the dynamic magnetisation is driven by an infinitely thin wire of current at the point (y',x'), also belonging to the same cross-section.…”

Section: B Radiation Lossesmentioning

confidence: 99%

“…The microwave conductivity contribution to the stripline broadband ferromagnetic resonance (FMR) response of highly-conducting (metallic) magnetic multilayers and nanostructures of sub-skin-depth thicknesses has attracted significant attention in recent years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. It has been shown that these effects are important when the microwave magnetic field is incident on only one of the two surfaces of a planar metallic material (see e.g.…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that these effects are important when the microwave magnetic field is incident on only one of the two surfaces of a planar metallic material (see e.g. [17]). …”

Section: Introductionmentioning

confidence: 99%

“…The geometry of a stripline ferromagnetic resonance experiment [17][18][19][20][21] is characterized by such single-surface incidence of the microwave magnetic field on the sample. This experiment usually employs a macroscopic coplanar (CPW) or microstrip (MSL) stripline through which a microwave current flows (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Coupling of microwave magnetic dynamics in thin ferromagnetic films to stripline transducers in the geometry of the broadband stripline ferromagnetic resonance

Kostylev

2016

Journal of Applied Physics

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Abstract. We constructed a quasi-analytical self-consistent model of the striplinebased broadband ferromagnetic resonance (FMR) measurements of ferromagnetic films. Exchange-free description of magnetization dynamics in the films allowed us to obtain simple analytical expressions. They enable quick and efficient numerical simulations of the dynamics. With this model we studied the contribution of radiation losses to the ferromagnetic resonance linewidth, as measured with the stripline FMR. We found that for films with large conductivity of metals the radiation losses are significantly smaller than for magneto-insulating films. Excitation of microwave eddy currents in these materials contributes to the total microwave impedance of the system. This leads to impedance mismatch with the film environment resulting in decoupling of the film from the environment and, ultimately, to smaller radiation losses. We also show that the radiation losses drop with an increase in the stripline width and when the sample is lifted up from the stripline surface. Hence, in order to eliminate this measurement artefact one needs to use wide striplines and introduce a spacer between the film and the sample surface. The radiation losses contribution is larger for thicker films.

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Section: B Radiation Lossesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…It has been shown that these effects are important when the microwave magnetic field is incident on only one of the two surfaces of a planar metallic material (see e.g. [17]). …”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coupling of microwave magnetic dynamics in thin ferromagnetic films to stripline transducers in the geometry of the broadband stripline ferromagnetic resonance

Kostylev

2016

Journal of Applied Physics

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“…This can be done in a simple broadband stripline ferromagnetic resonance (FMR) experiment [47], since in this case the microwave magnetic field is naturally incident only on one of the two surfaces of a planar nanostructure. The perfect shielding effect due to high conductivity of metals breaks the inversion symmetry.…”

Section: Introductionmentioning

confidence: 99%

Microwave magnetic dynamics in ferromagnetic metallic nanostructures lacking inversion symmetry

Kostylev

Yang

Maksymov

et al. 2016

Journal of Applied Physics

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In this work we carried out systematic experimental and theoretical investigations of the ferromagnetic resonance (FMR) response of quasi-twodimensional magnetic nano-objects -microscopically long nanostripes made of ferromagnetic metals. We were interested in the impact of the symmetries of this geometry on the FMR response. Three possible scenarios, from which the inversion symmetry break originated were investigated: (1) from the shape of the stripe crosssection, (2) from the double-layer structure of the stripes with exchange coupling between the layers, and (3) from the single-side incidence of the microwave magnetic field on the plane of the nano-pattern. The latter scenario is characteristic of the stripline FMR configuration. It was found that the combined effect of the three symmetry breaks is much stronger than impacts of each of these symmetry breaks separately. I. IntroductionFerromagnetic resonance (FMR) is a powerful tool for studying dynamic properties of metallic ferromagnetic thin films and nanostructures (see e.g., Refs. [1][2][3][4][5][6][7][8][9][10][11][12]). These materials are important for the emerging fields of magnonics [13], microwave spintronics [14][15][16][17], and for novel sensor applications [18][19][20][21].Macroscopically-long stripes with sub-micron cross-section made of ferromagnetic materials have attracted a lot of attention, because this geometry is a very convenient model object for studying the impact of geometric confinement on magnetization dynamics on the sub-micrometre and nanometer scales [22][23][24][25][26][27][28][29][30]. The main reasons for the attractiveness of this geometry are the practical absence of a static demagnetizing field H ds when the external field is applied along the stripes (i.e. along the axis y in Fig. 1(a)) and the quasi-two-dimensional (2D) character of the dynamics.The former property allows clear separation of the static and dynamic demagnetizing effects. Furthermore, because of the absence of H ds , the static magnetization configuration for the stripes is very simple. The static magnetization vector has the same magnitude -equal to the saturation magnetization for the material -and the same direction -along the stripe -for every point on the stripe crosssection. Due to strong shape anisotropy for this geometry, this configuration remains very stable even at remanence [29][30][31]. The simplicity of the magnetization ground state, together with the 2D character of the magnetization dynamics, results in simple analytical and quasi-analytical theoretical models able to deliver a clear physical

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Magnonic Crystals

Gruszecki

Krawczyk

2016

Wiley Encyclopedia of Electrical and Electronics Engineering

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Magnonic crystals can be regarded as the magnetic counterpart of photonic crystals, with spin waves acting as information carriers. Thus, magnonic crystals are magnetic materials with periodic distribution of the constituents or periodic modulation of some magnetic parameters (e.g., saturation magnetization or magnetocrystalline anisotropy), or other parameters relevant to the propagation of spin waves (e.g., external magnetic field, film thickness, stress, or a surrounding of the homogeneous ferromagnetic film). The spin waves propagating in magnonic crystal have a form of Bloch waves, and the dispersion relation includes frequency bands allowing spin wave propagation and frequency band gaps, forbidden for spin wave propagation. By adjusting relevant parameters of the magnonic crystal or external fields, the spectrum of spin waves can be tuned and the flow of spin waves can be tailored in the way unavailable with homogeneous media. The new physical effects occurring in magnetic nanostructures with periodic pattern and prospective applications of magnonic crystals, especially in integrated microwave devices and for processing information at microwave frequencies, drive the new fields of magnonics and magnon spintronics.

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Broadband stripline ferromagnetic resonance spectroscopy of ferromagnetic films, multilayers and nanostructures

Cited by 154 publications

References 221 publications

Coupling of microwave magnetic dynamics in thin ferromagnetic films to stripline transducers in the geometry of the broadband stripline ferromagnetic resonance

Coupling of microwave magnetic dynamics in thin ferromagnetic films to stripline transducers in the geometry of the broadband stripline ferromagnetic resonance

Microwave magnetic dynamics in ferromagnetic metallic nanostructures lacking inversion symmetry

Magnonic Crystals

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