In situ monitoring of the magnetization rotation of a soft layer using microwave permeability measurements

Temmerman, G. De; Pagès, H.; Acher, O.; Dubourg, S.; Schoenstein, Frédéric; Queste, S.; Ledieu, M.

doi:10.1016/j.jmmm.2004.11.251

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…This ratio has already been used in order to assess the effect of field annealing on the orientation of the magnetization. 32 The result presented here extends the validity of the method to thicker films. Multilayers have also been designed to provide both magnetic softness and high saturation magnetization, by alternating materials with different saturation magnetization but with the same uniaxial in-plane orientation.…”

Section: B Application To Soft Films With Magnetization Dispersion Asupporting

confidence: 66%

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Generalization of Snoek’s law to ferromagnetic films and composites

2008

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Section: B Application To Soft Films With Magnetization Dispersion Asupporting

confidence: 66%

Section: B Application To Soft Films With Magnetization Dispersion An...supporting

confidence: 66%

Generalization of Snoek’s law to ferromagnetic films and composites

2008

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“…This feature indicates that the uniform resonance model did not apply to this sample, and casts some doubt on the validity of (1) and (2) in this case. It is indeed well known that soft ferromagnetic films deviate from the uniform resonance model in many cases [10]- [12] The quantity represented in Fig. 3 is obtained by integrating the spectra along the direction, cf Fig.…”

Section: Resultsmentioning

confidence: 99%

How to Retrieve More Information on Magnetic Films From Microwave Permeability Measurements

2008

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The microwave permeability of soft thin films is a useful quantity for the design of fast, high-frequency systems. A number of setups now provide reliable permeability measurements. It is quite common to determine the saturation magnetization from the permeability measurements by using either a generalization of Snoek's law, or a curve fit with the Landau-Lifschitz model. This is a good way of verifying the consistency of the microwave measurements, since the saturation magnetization can be obtained by other means. However, in certain cases the permeability spectra reveal some features that cannot be accounted for by the uniform Landau-Lifschitz model, due to skin effect, heterogeneities, spinwave excitations, etc. The present article demonstrates that a better way to obtain reliable saturation magnetization values from permeability spectra is to use quantities based on the integral of the imaginary part of the measured permeability. Such quantities can also be used to determine the standard deviation of the magnetization orientation within the sample. These theoretical results are illustrated on CoZr thin films of various thicknesses, as well as on samples with a large built-in dispersion of the magnetization orientation.

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