Tuning Mie scattering resonances in soft materials with magnetic fields.

AI: Melanie Research RF Safe Research Library Jan 1, 2013 NEUTRAL MEDIUM

This paper proposes a reversible approach to tune Mie scattering resonances in random media using external low induction magnetic fields. The experimental demonstration uses ultrasound in emulsions of fluorinated ferrofluid droplets dispersed in a Bingham fluid. Magnetic-field-induced droplet deformation is reported to substantially change effective medium properties, including a fivefold change in effective acoustic attenuation depending on field strength and orientation.

Key points

The study proposes tuning Mie scattering resonances in random media via external low induction magnetic fields.
The approach is stated to be applicable to both electromagnetic and acoustic waves.
Experiments are demonstrated using ultrasound in emulsions containing fluorinated ferrofluid spherical droplets.
An applied magnetic field deforms droplets into prolate spheroids with a reported aspect ratio of about 2.5.
Droplet shape change is reported to drastically affect the effective properties of the disordered medium.
The effective acoustic attenuation coefficient is reported to vary by a factor of 5 with magnetic flux density and field orientation.

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