Probing the anharmonicity of the potential well for magnetic vortex core in nanodot
arXiv:1307.5429 · doi:10.1103/PhysRevLett.111.247601
Abstract
The anharmonicity of the potential well confining the position of the magnetic vortex core is measured dynamically with a Magnetic Resonance Force Microscope (MRFM). The stray field of the MRFM tip is used to displace the core position away from the well minimum. Anharmonicity is then inferred from the relative frequency shift induced on the eigen-frequency of the vortex core translational mode. Traces of these shifts are recorded while scanning the tip above an isolated nanodot, patterned out of a single crystal FeV film. An analytical framework is proposed to analyze the data. It results in a quantitative measurement of the anharmonic coefficient found to be positive and 50% of the parabolic contribution. This calibrates the tunability of the gyrotropic mode by external magnetic fields. In our sample, we observe a variation of the eigen-frequency as high as +10% for a displacement of the vortex core to about one third of the nanodot radius.
5 pages, 4 figures
References in corpus (8)
- MuMax: a new high-performance micromagnetic simulation tool
- Magnetic Vortex Resonance in Patterned Ferromagnetic Dots
- A Frequency-Controlled Magnetic Vortex Memory
- Bistability of vortex core dynamics in a single perpendicularly magnetized nano-disk
- Ferromagnetic resonance force spectroscopy of individual sub-micron size samples
- Optimal control of vortex core polarity by resonant microwave pulses
- Surface Roughness Dominated Pinning Mechanism of Magnetic Vortices in Soft Ferromagnetic Films
- Measurement of the dynamical dipolar coupling in a pair of magnetic nano-disks using a Ferromagnetic Resonance Force Microscope
Cited by in corpus (8)
- Origin of spectral purity and tuning sensitivity in a vortex-based spin transfer nano-oscillator
- Experimental and Numerical Understanding of Localized Spin Wave Mode Behavior in Broadly Tunable Spatially Complex Magnetic Configurations
- Localized magnetic fields enhance the field-sensitivity of the gyrotropic resonance frequency of a magnetic vortex
- Vortex precession frequency and its amplitude-dependent shift in cylindrical nanomagnets
- Non-linear radial spinwave modes in thin magnetic disks
- Electrical measurement of magnetic-field-impeded polarity switching of a ferromagnetic vortex core
- Exchange-mediated, non-linear, out-of-plane magnetic field dependence of the ferromagnetic vortex gyrotropic mode frequency driven by core deformation
- Chirality-mediated bistability and strong frequency downshifting of the gyrotropic resonance of a dynamically de-stiffened magnetic vortex