Generalized Measurement Method for the Determination of the Dynamic Behavior of Magnetic Materials in Any Magnetization State

Abstract

A broad-band characterization method based on the junction of the full-wave analysis of a nonreciprocal strip transmission line with a predictive permeability tensor model is presented. The aim of this method is the direct measurement of the permeability tensor components spectra of magnetized thick samples, whatever their magnetization state is. The propagation constants of the dominant transverse electromagnetic (TEM) and higher order modes inside the measurement cell are obtained along with its scattering parameters (S-parameters). The apparition of magnetostatic modes and the nonreciprocal nature of the structure are probed. Procedures based on the use of this method to find accurate values of gyromagnetic resonance and the resonance line width (1 ) are proposed. The direct analysis is validated by comparison of the calculated S-parameters with those obtained with an electromagnetic field simulator based on finite element methods (FEM).

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

“…Also, often the stripline technique is used to drive magnetisation precession in ferromagnetic materials, but the FMR absorption signal is read in a "non-microwave" way, for instance with an MFM-tip ("MFM-FMR", see, e.g., [221,222,223,224,225,226]), with micro-focus Brillouin Light Scattering (BLS) method (see, e.g., [227,228]), or using the inverse Spin-Hall Effect (see, e.g., [229,230,231,232]) or similar electronic/spintronic methods (see, e.g., [86,233,234,235,236,237]). We also have not described the large areas of magnonics and spintronics in their entirety, but addressed these topics only from a perspective of BFMR as such.…”

Broadband permeability measurement method for ferrites at any magnetization state: Experimental results

“…The method we have worked out is based on the measurement of the scattering parameters (S-parameters) of a strip transmission line partially filled with the magnetic material to be characterized. 2 As shown in Figure 1, two identical slabs of the magnetic sample are set above and below the strip conductor. At each side of the strip two different dielectrics are placed (respective permittivities e 1 and e 2 ) to insure the non-reciprocal behavior (S 21 6 ¼ S 12 ) of the line when the material under test is magnetized.…”

Ferrite Ceramics at Microwave Frequencies: Applications and Characterization

“…Diagram of asymmetrical cells : rectangular waveguide and strip transmission line Figure 28 shows schemes of two methods based on (i) an asymmetrically loaded rectangular waveguide (Queffelec P. et al 2000) and (ii) an asymmetrically loaded strip line (Lezaca J. E et al 2010, Lezaca J. E et al 2011). In the latter method, the measurement cell consists of an asymmetric strip line partially filled with the material to be characterized.…”