Development of vortex state in circular magnetic nanodots: Theory and experiment
نویسندگان
چکیده
J. Mejía-López,1,2 D. Altbir,2,3 P. Landeros,4 J. Escrig,2,3 A. H. Romero,5 Igor V. Roshchin,6,7 C.-P. Li,8 M. R. Fitzsimmons,9 X. Batlle,10 and Ivan K. Schuller8 1Facultad de Física, Pontificia Universidad Católica, Avenida Vicuña Mackenna 4860, Santiago, Chile 2Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 917-0124 Santiago, Chile 3Departamento de Física, Universidad de Santiago de Chile (USACH), Avenida Ecuador 3493, 917-0124 Santiago, Chile 4Departamento de Física, Universidad Técnica Federico Santa María, Avenida España 1680, Casilla 110-V, 2340000 Valparaíso, Chile 5Materials Department, CINVESTAV, Querétaro, Mexico 6Department of Physics and Astronomy, Texas A&M University, 4242 TAMU, College Station, Texas 77843-4242, USA 7Materials Science and Engineering Program, Texas A&M University, 3003 TAMU, College Station, Texas 77843-3003 USA 8Department of Physics, University of California–San Diego, La Jolla, California 92093-0319, USA 9Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA 10Departament de Fisica Fonamental, Universitat de Barcelona, 08028, Barcelona, Catalonia, Spain !Received 30 December 2009; revised manuscript received 9 April 2010; published 18 May 2010"
منابع مشابه
Higher order vortex gyrotropic modes in circular ferromagnetic nanodots
Magnetic vortex that consists of an in-plane curling magnetization configuration and a needle-like core region with out-of-plane magnetization is known to be the ground state of geometrically confined submicron soft magnetic elements. Here magnetodynamics of relatively thick (50-100 nm) circular Ni80Fe20 dots were probed by broadband ferromagnetic resonance in the absence of external magnetic f...
متن کاملMagnetic fingerprints of sub-100 nm Fe dots
Sub-100 nm nanomagnets not only are technologically important, but also exhibit complex magnetization reversal behaviors as their dimensions are comparable to typical magnetic domain wall widths. Here we capture magnetic “fingerprints” of 109 Fe nanodots as they undergo a single domain to vortex state transition, using a first-order reversal curve FORC method. As the nanodot size increases from...
متن کاملVortex state and effect of anisotropy in sub-100-nm magnetic nanodots
Magnetic properties of Fe nanodots are simulated using a scaling technique and Monte Carlo method, in good agreement with experimental results. For the 20-nm-thick dots with diameters larger than 60 nm, the magnetization reversal via vortex state is observed. The role of magnetic interaction between dots in arrays in the reversal process is studied as a function of nanometric center-to-center d...
متن کاملVortex-in-nanodot potentials in thin circular magnetic dots.
Vortex states in thin circular magnetic nanodots are studied using auxiliary constraining fields as a way to map out the potential energy space of a vortex, while avoiding a rigid vortex approximation. In the model, isotropic Heisenberg exchange competes with the demagnetization field caused by both surface and volume magnetization charge densities. The system energy is minimized while applying...
متن کاملA Linear Approach to the Control of Vortex Induced Vibrations of Circular Cylinders with a 2-D Van der Pol Model for Structural Oscillator
In the present paper, a new 2-D Van der Polstructural oscillator model is introduced for the vortex induced vibrations of circular cylinders.The main purpose of this task is to control the recently introduced model by means of modern control definitions in state space. In order to control the system, the whole model is linearized about its equilibrium point by deriving state-space matrices. The...
متن کامل