21. The dependence on the thickness of the ferromagnetic layer can be given as: 22. A familiar example of SSB is in ferromagnetic materials. 23. Hence the overall energy saving can lead to ferromagnetic alignment of neighboring ions. 24. These are the ferromagnetic , ferrimagnetic and antiferromagnetic materials. 25. The other is magnetostriction when the material is ferromagnetic . 26. The nature of the superconducting state in ferromagnetic superconductors is currently under debate. 27. Would a negatively or positively charged plastic rod attract ferromagnetic objects like iron? 28. Metallic iron and the alloy alnico are examples of ferromagnetic materials involving transition metals. 29. This is a spontaneous magnetism which is a property of ferromagnetic and ferrimagnetic materials. 30. That pole then strongly attracts adjacent ferromagnetic objects.