μSR studies on the response of spin dynamics to applying or removing magnetic field-Typical Ising spin glass Fe0.50Mn0.50TiO3

One of the distinguishing properties of spin glass (SG) systems is a long-time relaxation of magnetization below the SG transition temperature. Motivated by the interests on how the microscopic spin dynamics is related to the macroscopic behavior of spin system in the SG state, we have performed the μSR measurement for a typical Ising SG system Fe0.50Mn0.50TiO3 under various experimental conditions. We also pay attention to how the spin dynamics responds to a sudden change of magnetic fields. Thus, we have discussed the spin dynamics of SG system which had not been detected before our μSR measurement. For example, we have shown that the switching-off of a magnetic field at the field-cooled state makes the spin fluctuations faster. Moreover, such spin fluctuations have shown to remain faster at least up to the order of 2 h, although the thermoremanent magnetization decays dramatically within 2 h.