Broadband ferromagnetic resonance measurements in thin-film structures for magnetoimpedance sensors

Detection of L-band electron paramagnetic resonance in the DPPH molecule using impedance measurements

“…23 Magnetoimpedance in so ferromagnetic metallic conductors has been investigated many researchers using either an inductance-capacitance-resistance (LCR) meter in the frequency range (10 kHz to few tens of MHz) by two/four probe methods or vector network analyzers in the frequency range 10 MHz to 20 GHz. [24][25][26] For the later case, a microstripline is photolithographically fabricated on a dielectric substrate. 27,28 On the other hand, we have recently have discovered that MI measured by passing microwave (MW) current directly through some electrically conducting Mn-based perovskite oxides can detect not only paramagnetic but also ferromagnetic resonance of exchange coupled t 2g spins of Mn 3+ :t 3 2g e 1 g and Mn 4+ :t 3 2g e 0 g ions.…”

Broadband measurements of the surface impedance in ferromagnetic wires as a boundary condition for scattering problems

“…Such plethora of functional materials and their increasing trend towards operating at broader bandwidth stimulate the development of accurate measurement techniques to characterize their MI and microwave behaviour. The most commonly used methods are based on shorted coaxial transmission lines [25][26][27], microstrip transmission lines (MTLs) and coplanar waveguides (CPWs) etched on printed circuit boards (PCBs) [28][29][30][31][32] aided by vector network analysers (VNAs). In the shorted coaxial lines, one end of the microwire is connected to the inner conductor, while the other end is connected to the ground of the coaxial cap.…”

“…VNA and the cables can be calibrated using the standard 12-term error correction model with the coaxial SHORT-OPEN-LOAD-THRU (SOLT) terminations. The strip waveguides must be deembedded based on different methods [28,30,31,34]. In turn, an elongated sample over a continuous ground (or segment of a loaded strip) constitutes a structure which waveguide properties must be considered when calculating material parameters from the S-parameter measurements.…”

Ferromagnetic Resonance of FeNi/Cu/FeNi Thin Film on Coplanar Waveguide with Operating Frequency of 1 to 20 GHz

“…1. In analyzing the parameters of ferromagnetic resonance (FMR) [11,12] and magnetic impedance [2,3] of thin films, the operating range of the ferromagnetic film on a microstrip significantly reduces to about 3 GHz [13]. This is because the mismatch between the wave impedance of the microstrip line and the coplanar waveguide with a ferromagnetic film and also radiation losses with increasing operating frequency.…”

“…A fabrication of magneto-sensitive elements in one cycle with coplanar waveguides is more preferable both for research and integrated microelectronics highly demanding miniaturization of components. FeNi-based film macro-and nanostructures are used in hardware components of spintronics and magnetic sensors [13,14]. The quasi-twodimensional magnetodynamic nature of these structures does not provide a constant demagnetizing field along the long film side.…”