is) 0.()The which 0and间 ower curve).△■ Chapter Five:Order and magnetic structure 1.Teaching aims Know the different types of magnetic ground state which can be produced by these interactions (a) (b) (c) 141 d 00①00000④⊕0000000 0000000000009000 2.Keypoints and Difficulties Keypoints:The Weiss model of a ferromagnet;Weiss model of an antiferromagnet Chapter Five: Order and magnetic structure 1. Teaching aims Know the different types of magnetic ground state which can be produced by these interactions 2. Keypoints and Difficulties Keypoints: The Weiss model of a ferromagnet; Weiss model of an antiferromagnet