菱铁矿热处理后的异常等温剩磁与逆向磁化

菱铁矿经过适当温度热处理后的异常等温剩磁曲线的全部形态与初始剩磁态的３个集合相对应。根据ＩＲＭ曲线存在负微商线段这一事实，提出有逆磁相存在，并用正常磁相和逆磁相的耦合来解释这种异常等温剩磁行为，这种逆向剩磁是在室温下获得的，在弱化时没有任何热过程和化学过程发生，在本质上已与观察到的逆向热剩磁和逆向化学剩磁不同。

The Anomaly if the Isothermal Remanent Magnetization of the Heated Siderite and the Reverse Magnetization

All the shapes of the isothermal remanent magnetization(IRM)curves of the samples,which were derived from the heat-treated siderite and sand siderite samples within a certain ternperature range, can be divided into three types, each corresponding one essamble of the initial states of remanent magnetization. Accord-ing to the existence of segments with minus slope for the anomalous IRM curves,a reverse magnetic phase is suggested to have occurred during the heat treatment be-fore and the anomalous behavior of IRM curve is tentatively explained with the cou-pling between a normal magnetic phase and a reverse magnetic phase. This kind of revere remanent magnetization were obtained by magnetizing at the room tempera-ture and no any thermal and chemical processes participate in the magnetking.Thet6fore,it differs,in essence,from the thermal and chemical reverse remanentmagnetization which have been observed before.