The angular dependence of local magnetization hysteresis loops has bee
n measured in Bi2Sr2CaCu2O8+y single crystals by using micro Hall prob
es. It was uncovered that the angular dependences of both the melting
transition and the peak field deviate from the expectation by the anis
otropic GL model. In addition to the above results, we found new peak
structures in hysteresis loops in oblique fields. A possible origin of
this new peak structure is discussed.