An improved permeameter for thin film measurements up to 6 GHz

Abstract

Articles you may be interested inAn induction method to calculate the complex permeability of soft magnetic films without a reference sample Rev. Sci. Instrum. 85, 054705 (2014); 10.1063/1.4876598 Improved accuracy thin film permeability extraction for a microstrip permeameter J. Appl. Phys. 113, 033906 (2013); 10.1063/1.4776715 Microwave permeability spectra of ferromagnetic thin films over a wide range of temperatures J. Appl. Phys. 93, 7202 (2003); 10.1063/1.1555902Broadband permeability measurement of ferromagnetic thin films or microwires by a coaxial line perturbation methodWe report a broad band technique allowing the measurement of the permeability of thin ferromagnetic films up to 6 GHz. The permeameter is based on a single coil technique. The input impedance of the loop is measured with and without the sample. The permeability is deduced from the impedance measurement using two approaches: the first one uses an equivalent electrical circuit model and the second a transmission line theory model. This leads to significant corrections compared to previous models. Calibration of the apparatus is presented using a known sample. Our two approaches are compared to the theoretical spectral permeability. The validity of the measurements is proven by showing a full spectral gyromagnetic response of a saturated magnetic sample at different fields.

The influence of the surface topography on the magnetization dynamics in soft magnetic thin films

“…We have measured the highfrequency magnetic response with a single-coil system connected to a network analyzer. 7 An electron-spin-resonance (ESR) setup working in X band ͑9.4 GHz͒ was also used.…”

Generalization of Snoek’s law to ferromagnetic films and composites

“…The permeability was determined using a thin film permeameter described elsewhere. 36 The typical error Δµ was estimated to approximately 20 for the thinnest film, and to 2 for the thicker ones.…”

Microwave Spectroscopy of a Single Permalloy Chiral Metamolecule on a Coplanar Waveguide

“…CPW FMR of a single Py chiral metamolecule FMR driven by H ac gives rise to the absorption of propagating microwaves [11]. The FMR signal is observed as a dip in the S 21 (S 12 ) spectra [12][13][14]. However, the FMR signal from the single metamolecule is quite small.…”