INVESTIGATION OF FERROMAGNETIC RESONANCE SHIFT IN SCREEN-PRINTED BARIUM FERRITE/SAMARIUM COBALT COMPOSITES
Camilo Velez, Seahee Hwangbo, Stasiu T. Chyczewski, Jacob Ewing, Renuka Bowrothu, Connor S. Smith, Yong-Kyu Yoon and David P. Arnold
This paper explores a method for incorporating samarium cobalt inclusions into screen-printed barium hexaferrite films in order to tune the ferromagnetic resonance (FMR). Using an all-low-temperature screen-printing process, thick composite films are fabricated using heterogeneous mixtures of magnetic particles in a polydimethylsiloxane (PDMS) binder. RF characterization is performed using two-port S-parameter measurements on a coplanar waveguide (CPW) with external magnetic bias fields. The films exhibit a self-biased FMR response that ranges from 41 to 53 GHz (12-GHz span) by varying the relative ratio of the hexaferrite and Sm-Co particles. These effects are attributed to the embedded Sm-Co particles providing additional internal field bias acting on the barium ferrite.
Keywords: Magnetic hysteresis, Barium, Magnetic resonance, Microwave theory and techniques and Perpendicular magnetic anisotropy