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VOLUME 49 (1989) | ISSUE 7 | PAGE 399
Direct observation of low-frequency magnetic fluctuations of 2D magnetic materials near the ordering temperature
A magnetic noise in the frequency band 0.01-10 Hz has been observed with the help of a SQUID magnetometer in a zero field in the 2D magnetic materials (CH3NH3) 2 · CuCl4 and Co (HCOO) 2 · 2H20 near the transition temperature. In the case of the Ising antiferromagnet Co (HCOO) 2 ■ 2HzO the fluctuations reach a maximum at TN, while in the Heisenberg ferromagnet (CH3NH3) 2 ■ CuCl4 they reach a maximum 0.4 К higher, apparently because a Kosterlitz-Thouless topological transition occurs in such systems. In both magnetic materials the noise has a l//spectrum.