When we measure a magnetic property of a sample using SQUID-VSM, we choose two types of cooling techniques. So my question is what is/are the advantage/advantages of getting the ZFC curve and FCC curve? and also if there is an anomaly in ZFC and FCC curve, like FCC increases but ZFC decreases, from that what will be the conclusions like what will be the state of the systems ?? Is it glassy or superparamagnetism ??