Study of Confined Spin Waves: Linear and Nonlinear Confinement by Brillouin Light Scattering (CAT#: STEM-ST-0154-YJL)

Introduction

The study of spin waves is a powerful method for probing the dynamic properties of magnetic media in general and those of laterally patterned magnetic structures in particular. From spin wave measurements basic information on the magnetic properties, such as magnetic anisotropy contributions, the homogeneity of the internal field, as well as coupling between magnetic elements can be extracted. This information is often hard to obtain by other methods. If the size of an element becomes comparable to the wavelength of a spin wave under investigation, lateral quantization e!ects appear, which lead to dramatic changes in the spin wave spectrum and the spin wave density of states.

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Principle Applications Procedure Materials Notes Related Products

Principle

From a quantum point of view, Brillouin scattering is an interaction of light photons with acoustic or vibrational quanta (phonons), with magnetic spin waves (magnons), or with other low frequency quasiparticles interacting with light. The interaction consists of an inelastic scattering process in which a phonon or magnon is either created (Stokes process) or annihilated (anti-Stokes process). The energy of the scattered light is slightly changed, that is decreased for a Stokes process and increased for an anti-Stokes process. This shift, known as the Brillouin shift, is equal to the energy of the interacting phonon and magnon and thus Brillouin scattering can be used to measure phonon and magnon energies.

Applications

Brillouin scattering is used to determine acoustic velocities and elastic properties of a number of crystalline solids, glasses, and liquids.

Procedure

1. Sample preparation
2. Measurement by scattering detection instrument
3. Data analysis

Materials

Brillouin scattering measurement system (Brillouin spectrometer)

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