An evaluation of permeability for striped thin films in the gigahertz range

Abstract

Articles you may be interested inAnalysis of steplike change of impedance for thin-film giant magnetoimpedance element with inclined stripe magnetic domain based on magnetic energy Secondary peaks on microwave permeability spectra of soft ferromagnetic thin films with in-plane anisotropy J. Appl. Phys. 97, 10F903 (2005); 10.1063/1.1851914 Microwave permeability spectra of ferromagnetic thin films over a wide range of temperatures J. Appl. Phys. 93, 7202 (2003); 10.1063/1.1555902Microwave permeability of ferromagnetic thin films with stripe domain structureWe developed the fully automatic permeameter which is made of driving plates and shielded loop coil available in 1 MHz-3GHz. We clarified the sensitivity of the permeameter and the sensitivity can be explained by an uncertainty of network analyzer. We evaluate the permeability of striped CoNbZr films ͑50, 20, 10 m wide͒. A reasonable relation between permeability spectrum and domain observations can be demonstrated.

Resonantly enhanced strip-line technique to measure microwave permeability of thin films

“…However, such technique has low sensitivity in case where measured reflection coefficient is close to unity, especially with samples having low permeance product [5], i.e., the product of sample susceptibility mÀ1 and sample cross-section S perpendicular to magnetic vector.…”

“…Therefore, the highest operating frequency f max for a short strip cell [1][2][3][4] is limited by cell length d cell . In practice, it is difficult to increase the highest operating frequency above 9 GHz even in microloop permeameters [5], as the shorter is the cell, the closer is the sample to strong non-uniform fields excited near the junction.…”