Nonlinear ferromagnetic resonance shift in submicron Permalloy ellipses

6 On - chip detection of ferromagnetic resonance of a single submicron permalloy strip

We measured ferromagnetic resonance of a single submicron ferromagnetic strip, embedded in an on-chip microwave transmission line device. The method used is based on detection of the oscillating magnetic flux due to the magnetization dynamics, with an inductive pickup loop. The dependence of the resonance frequency on applied static magnetic field agrees very well with the Kittel formula, demon...

Quantum transport in ferromagnetic permalloy nanostructures

We studied phase-coherent phenomena in mesoscopic permalloy Ni81Fe19 samples by exploring lowtemperature transport. Both differential conductance as a function of bias voltage and magnetoconductance of individual wires display conductance fluctuations. Analysis of these fluctuations yields a phase coherence length of 250 nm at 25 mK as well as a 1 / T temperature dependence. To suppress conduct...

High-frequency characterization of Permalloy nanosized strips using network analyzer ferromagnetic resonance

Analysis of ferromagnetic resonance response of square arrays of permalloy nanodots

We present a detailed comparison between the results of ferromagnetic resonance (FMR) measurements on a square array of permalloy nanodots and a numerical simulation based on the eigenvalues of the linearized Landau-Lifshitz equation. Of particular importance is the implementation of a recently developed technique for numerically calculating the absorption spectrum from the associated eigenvect...

Ferromagnetic resonance force microscopy studies of arrays of micron size permalloy dots

T. Mewes,1,2,* J. Kim,1 D. V. Pelekhov,1 G. N. Kakazei,1,3 P. E. Wigen,1 S. Batra,4 and P. C. Hammel1,† 1Department of Physics, Ohio State University, 191 West Woodruff Avenue, Columbus, Ohio 43210, USA 2Center for Materials for Information Technology and Department of Physics & Astronomy,University of Alabama, Box 870209, Tuscaloosa, Alabama 35487, USA 3Institute of Magnetism National Academy ...