-
- G. V. Kurlyandskaya
- University of Maryland FMR Group, Department of Physics, , 2221 Physics Building, College Park, Maryland 20742
-
- S. M. Bhagat
- University of Maryland FMR Group, Department of Physics, , 2221 Physics Building, College Park, Maryland 20742
-
- C. Luna
- Instituto de Ciencia de Materiales (CSIC) , Cantoblanco, 28049 Madrid, Spain
-
- M. Vazquez
- Instituto de Ciencia de Materiales (CSIC) , Cantoblanco, 28049 Madrid, Spain
書誌事項
- 公開日
- 2006-05-15
- DOI
-
- 10.1063/1.2191740
- 公開者
- AIP Publishing
この論文をさがす
説明
<jats:p>Ferromagnetic resonance (FMR) and microwave magnetoabsorption can be expected to be powerful tools for characterization of magnetic nanoparticles. In the present work, we have studied the FMR and magnetic field dependence of nonresonant microwave losses in CoNi nanoparticles of about 45, 100, and 200nm caliper sizes prepared by the polyol technique. Contrary to our expectation, FMR lines, although wide, show that the particles are not truly spherical. Subsequent scanning and transmission electron microscopy investigations have confirmed this finding. Further, as before, all the powders are found to have large zero field absorption which reduces on application of a direct current (dc) field parallel to the microwave magnetic field but is relatively insensitive to a dc field if the powder is located in the microwave electric field, hence defining a magnetoimpedance for the system.</jats:p>
収録刊行物
-
- Journal of Applied Physics
-
Journal of Applied Physics 99 (10), 104308-, 2006-05-15
AIP Publishing