Magnetic behaviors of two spheres which contact each other with an area

摘要

In the chain of spheres model proposed by Jacobs and Bean, spheres contact each other at a point. In order to see the change of the magnetic behaviors of the chain of spheres when spheres begin to contact each other with an area, we consider the chain of two spheres. Critical fieldHcrifor the irreversible rotation of the magnetization and coercive forceHcby both the parallel rotation and fanning mechanisms are calculated as a function of the contact area. Uniaxial magnetic anisotropy constantKuby the parallel rotation mechanism is also calculated as a function of the contact area.Ku,Hcri, andHcare found to increase, reach a maximum value, and decrease with an increase in contact area. The maximum values ofKuandHcriby the parallel rotation mechanism are found to be 30 larger than the values ofKuandHcrifor the point contact. The maximum value ofHcriby the fanning mechanism is found to be 15 larger than the value ofHcrifor the point contact.