Measurement of the dynamical dipolar coupling in a pair of magnetic nano-disks using a Ferromagnetic Resonance Force Microscope

Abstract

We perform an extensive experimental spectroscopic study of the collective spin-wave dynamics occurring in a pair of magnetic nano-disks coupled by the magneto-dipolar interaction. For this, we take advantage of the stray field gradient produced by the magnetic tip of a ferromagnetic resonance force microscope (f-MRFM) to continuously tune and detune the relative resonance frequencies between two adjacent nano-objects. This reveals the anti-crossing and hybridization of the spin-wave modes in the pair of disks. At the exact tuning, the measured frequency splitting between the binding and anti-binding modes precisely corresponds to the strength of the dynamical dipolar coupling $\Omega$. This accurate f-MRFM determination of $\Omega$ is measured as a function of the separation between the nano-disks. It agrees quantitatively with calculations of the expected dynamical magneto-dipolar interaction in our sample.

References in corpus (8)

• Hybrid quantum circuit with a superconducting qubit coupled to a spin ensemble
• Dynamics of coupled vortices in a pair of ferromagnetic disks
• Ferromagnetic resonance force spectroscopy of individual sub-micron size samples
• Identification and selection rules of the spin-wave eigen-modes in a normally magnetized nano-pillar
• Phase locking dynamics of dipolarly coupled vortex-based spin transfer oscillators
• Oscillatory Energy Exchange Between Waves Coupled by a Dynamic Artificial Crystal
• Origin of four-fold anisotropy in square lattices of circular ferromagnetic dots
• Magnetic resonance spectroscopy of perpendicularly magnetized permalloy multilayer disks

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• Probing the anharmonicity of the potential well for magnetic vortex core in nanodot
• Magnetization nutation induced by surface effects in nanomagnets
• Ferromagnetic resonance of a magnetic dimer with dipolar coupling
• Quantum loss of synchronization in the dynamics of two spins
• Ferromagnetic resonance of a two-dimensional array of nanomagnets: Effects of surface anisotropy and dipolar interactions
• Driven energy transfer between coupled modes in spin-torque oscillators
• Magnetodynamic properties of dipole-coupled 1D magnonic crystals
• Single-particle versus collective effects in assemblies of nanomagnets: screening
• Ferromagnetic resonance of coupled shifted chains of nano-elements