2:30 PM–5:30 PM, Thursday, March 13, 2008
Morial Convention Center - 225
Sponsoring Units:
GMAG DMP FIAP
Chair: Rembert Duine, Utrecht University
Abstract ID: BAPS.2008.MAR.W32.12
5:06 PM–5:18 PM
Matthew Vannette
(Iowa State University, Dept of Physics \& Astronomy and Ames Laboratory)
Sergey Bud'ko
(Iowa State University, Dept of Physics \& Astronomy and Ames Laboratory)
Paul Canfield
(Iowa State University, Dept of Physics \& Astronomy and Ames Laboratory)
Ruslan Prozorov
(Iowa State University, Dept of Physics \& Astronomy and Ames Laboratory)
Measurements of radio-frequency dynamic susceptibility of ferromagnets exhibit striking differences between local moment and itinerant systems. Whereas local moment systems show a sharp peak at the Curie temperature ($T_c$) which evolves to higher temperatures and lower amplitudes with applied dc magnetic field, itinerant systems show a broad maximum at temperatures well below $T_c$. The itinerant system's maximum is suppressed in amplitude and shifts to lower temperatures with applied dc magnetic field. Existing Stoner or spin fluctuations theories derive strictly zero-field susceptibility and we propose a generalization of these models to incorporate the effect of applied dc field. A good agreement between our semi-phenomenological approach and experimental results obtained on several generally accepted itinerant materials with various $T_c$'s is presented.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.MAR.W32.12