Abstract
We studied quasi-two-dimensional magnetic domain structures using a small-angle light scattering technique. The structures are formed when magnetic particles in an aqueous suspension between two parallel glass plates are assembled and oriented in a magnetic field H perpendicular to the plates. Three different structure regions can be identified, and they are bounded by two critical field lines H c1 (φ) and H c2(φ). Below H c1 (φ) the system consists of single particles; between H c1 (φ) and H C2 (φ), the particles assemble into elongated disordered domains; and above H c2 (φ), the domains develop a strong in-plane correlation. In the strong field limit H ⪢ H c2, the structure factor of the magnetic fluid resembles that of a two-dimensional liquid. However, long lasting metastability and hysteresis observed in the experiment suggest that the system is essentially locked in a glassy state.
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