Title :
Nonreciprocal Spin Waves in Co-Ta-Zr Films and Multilayers
Author :
Amiri, Pedram Khalili ; Rejaei, Behzad ; Zhuang, Yan ; Vroubel, Marina ; Lee, Dok Won ; Wang, Shan X.
Author_Institution :
Dept. of Electr. Eng., Univ. of California, Los Angeles, CA, USA
Abstract :
The propagation of spin waves in single and multilayered ferromagnetic Co-Ta-Zr films is experimentally investigated in this work. Two microstrip antennas placed on top of the magnetic core are used for signal transmission and reception. A metallic ground layer placed on one side of the magnetic film leads to nonreciprocal spin wave dispersion, resulting in a direction-dependent coupling of the antennas. Compared to previous experiments with Ni-Fe films, the higher resistivity of the Co-Ta-Zr reduces the energy dissipation in the device and allows for the incorporation of a thicker magnetic film, thereby increasing the nonreciprocity and the spin wave propagation frequency range. In the case of the Co-Ta-Zr/SiO2 multilayer, the spin wave-mediated coupling of the antennas is strongly dependent on the relative orientation of the magnetizations in the individual layers, and on the application of an external magnetic field.
Keywords :
cobalt alloys; electrical resistivity; ferromagnetic materials; magnetic cores; magnetic microwave devices; magnetic multilayers; magnetic thin films; magnetisation; microstrip antennas; silicon compounds; spin waves; tantalum alloys; zirconium alloys; CoTaZr-SiO2; direction-dependent coupling; energy dissipation; external magnetic field; ferromagnetic thin films; magnetic core; magnetizations; metallic ground layer; microstrip antennas; microwave magnetic devices; multilayers; nonreciprocal spin wave propagation; reception; relative orientation; resistivity; signal transmission; Magnetic microwave devices; magnetic multilayers; nonreciprocal devices; soft magnetic films; spin waves;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2009.2022491