Experiment 6 Investigation of the properties of Magnetic Material Magnetic material has been widely used in electric power,communication,electronic machine, autocar,computer,information storage and so on.Its two basic features can be shown by magnetic hysteresis loop and Curie temperature.The former one reflects the magnetization character of magnetic material in magnetic field,and the later one is related to the phase transition from ferromagnetic state to paramagnetic state. In this experiment,the Curie temperature and dynamic hysteresis loop of soft ferromagnetic material will be measured. 【Aim of the experiment】. 1. Get the knowledge of magnetic hysteresis loop,magnetization curve and Curie temperature.Have a deep understanding of some concepts about ferromagnetic material,such as coercive force,residual magnetic flux density,saturated magnetic flux density and magnetic permeability. 2. Observe hysteresis loop through an oscilloscope. Measure the Curie temperature of the ferromagnetic material given in this experiment. 【Principle of the experiment】. 1.The magnetization properties Magnetism is a property of materials that respond to an applied magnetic field.The rule of magnetization can be described by magnetic flux density (magnetic induction)B, B◆I A B-H M-H H T Fig.1 Magnetization curve of ferromagnet and L-H curve Fig.2 L-T curve of ferromagnet- - 1 Experiment 6 Investigation of the properties of Magnetic Material Magnetic material has been widely used in electric power, communication, electronic machine, autocar, computer, information storage and so on. Its two basic features can be shown by magnetic hysteresis loop and Curie temperature. The former one reflects the magnetization character of magnetic material in magnetic field, and the later one is related to the phase transition from ferromagnetic state to paramagnetic state. In this experiment, the Curie temperature and dynamic hysteresis loop of soft ferromagnetic material will be measured. 【Aim of the experiment】 1. Get the knowledge of magnetic hysteresis loop, magnetization curve and Curie temperature. Have a deep understanding of some concepts about ferromagnetic material, such as coercive force, residual magnetic flux density, saturated magnetic flux density and magnetic permeability. 2. Observe hysteresis loop through an oscilloscope. 3. Measure the Curie temperature of the ferromagnetic material given in this experiment. 【Principle of the experiment】 1 .The magnetization properties Magnetism is a property of materials that respond to an applied magnetic field. The rule of magnetization can be described by magnetic flux density (magnetic induction) B, Fig. 1 Magnetization curve of ferromagnet and μ ~ H curve Fig. 2 μ ~ T curve of ferromagnet