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The influence of Brownian torque on the motion of magnetic microparticles is experimentally determined using optical tweezers. Rotational Brownian motion induces the flattering of the breakdown transition between synchronous and asynchronous modes of microparticle rotation. Direct observation of trapped microparticles motion shows significant enhancement of Magnus effect due to the inhomogeneity of temperature distribution in flow around rotating microparticle which slihgtiy absorbs laser tweezers radiation.