Broadband Magnetic Response of Periodic Arrays of FeNi Dots

• Type: Article in International Scientific Journal
• Date: 2008

Authors

Sierra, JF (Author) Other; Awad, AA (Author) Other; G.N. Kakazei (Author) REIT; Palomares, FJ (Author) Other; Alievi, FG (Author) Other

Journal

Title: IEEE Transactions on Magnetics

Vol. 44 No. 11

Pages: 3063-3066

ISSN: 0018-9464

Publisher: IEEE

Indexing

ISI Web of Knowledge - 7 Citations

Scopus - 8 Citations

Other information

Authenticus ID: P-003-V59

DOI: 10.1109/tmag.2008.2002527

Abstract (EN): We present a study of magnetization dynamics at room temperature in periodic arrays of 50 nm thick FeNi (Py) circular magnetic dots of 500 nm radius and different center to center distance (1200 and 2500 mu), by using a broadband magnetometer based on Vector Network Analyzer which works between 300 kHz and 8.5 GHz. We also present a comparison between the dynamic response, ferromagnetic resonance (FMR) and its linewidth, with static magnetic characteristics such as magnetization curves. The FMR peak appears just above the nucleation field and is perfectly described by Kittel formula taking into account the demagnetizing factor of an individual magnetic dot. In addition to FMR we observed a spin wave resonance below the uniform mode, which could be attributed to spin waves in confined systems. The FMR linewidth shows a significant broadening close to the field region corresponding to nucleation of magnetic vortex.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4