Impedance matrix of thin metallic ferromagnetic films and SSWR in parallel configuration

Chan, Ngoc; Kamberský, V.; Fraítová, D.

doi:10.1016/s0304-8853(99)00776-3

Cited by 11 publications

(19 citation statements)

References 11 publications

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“…3a. The variation of phase and amplitude, fitted according to the single-domain model in Chan et al 23 with layer-specific parameters constrained from Ghosh et al 24 , is shown in dashed lines. There is a rigid positive offset in precessional phase lag Df ¼ f Py À f CoFeB B0.7 rad, and roughly twice the precessional amplitude m We compare the behaviour of Py(15 nm)/Cu(10 nm)/CoFeB (15 nm) with that of a reversed deposition order CoFeB(15 nm)/ Cu(10 nm)/Py(15 nm) structure in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Detection of microwave phase variation in nanometre-scale magnetic heterostructures

et al. 2013

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The internal phase profile of electromagnetic radiation determines many functional properties of metal, oxide or semiconductor heterostructures. In magnetic heterostructures, emerging spin electronic phenomena depend strongly upon the phase profile of the magnetic fieldH at gigahertz frequencies. Here we demonstrate nanometre-scale, layer-resolved detection of electromagnetic phase through the radio frequency magnetic fieldH rf in magnetic heterostructures. Time-resolved X-ray magnetic circular dichroism reveals the local phase of the radio frequency magnetic field acting on individual magnetizationsM i through the susceptibility asM ¼wH rf . An unexpectedly large phase variation, B40°, is detected across spinvalve trilayers driven at 3 GHz. The results have implications for the identification of novel effects in spintronics and suggest general possibilities for electromagnetic-phase profile measurement in heterostructures.

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Section: Resultsmentioning

confidence: 99%

“…The response of magnetization to incident rf fields has been calculated using a transfer-matrix approach, suggested in Chan et al 23 Kostylev 30 has investigated freestanding, conductive ferromagnetic bilayers excited by a singlesided stripline. The calculations shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

Detection of microwave phase variation in nanometre-scale magnetic heterostructures

et al. 2013

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“…This concludes solution of the system of equations (2), (6)(7)(8)(9). We do no not show the expression for 0 ( ) A k here because it is extremely cumbersome (but easy to derive with some standard software for analytical calculations).…”

Section: Numerical Modelmentioning

confidence: 99%

“…We differentiate (6) and substitute (7) into the resulting differentiated equation and make use of (9). This gives: …”

Section: Numerical Modelmentioning

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%

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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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Magnetization Dynamics

Bailey

2016

Introduction to Magnetic Random&;#x02010;Access Memory

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Impedance matrix of thin metallic ferromagnetic films and SSWR in parallel configuration

Cited by 11 publications

References 11 publications

Detection of microwave phase variation in nanometre-scale magnetic heterostructures

Detection of microwave phase variation in nanometre-scale magnetic heterostructures

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

Magnetization Dynamics

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