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Originally developed during NASA's Apollo program in the 1960s, magnetic liquid (ferrofluid) is a magnetically responsive material composed of ~10 nm magnetic nanoparticles, surfactants, and a liquid carrier. Thanks to surface treatments, these colloids remain stable even under strong magnetic field gradients.
Today, magnetic liquids have become a vital component in high-performance loudspeakers. At Moretec, we provide speaker-grade ferrofluid magnetic liquid formulations that improve acoustic performance, reliability, and manufacturability.
Magnetic liquid fills the gap between the voice coil and magnetic circuit, improving heat transfer and reducing thermal stress. This allows the speaker to handle higher power levels with greater reliability.
The viscous nature of magnetic liquid helps center the voice coil during operation, reducing misalignment and friction-related damage. This leads to better mechanical stability and extended speaker lifespan.
Magnetic liquid acts as a damping medium, smoothing resonant peaks and flattening frequency response. The result is cleaner, more natural audio reproduction with reduced distortion.
The use of ferrofluid on a speaker assembly enhances tolerance accommodation and reduces defect rates, enabling greater consistency and efficiency in mass production.
Moretec's magnetic liquids for loudspeakers are available in a range of viscosities and magnetizations, customized to match various speaker designs and ensure compatibility with materials such as adhesives, coil formers, and frame structures.
