Micro-Magnetic Simulation Of Exchange Coupled Composite Magnetic Storage Media

As the magnetic storage technology is mature,low price,it has been the main media of electronic information storage.However,with the information technology go into the age of big data and mass storage,people need larger capacity and lower cost magnetic storage devices.Due to the existence of super-paramagnetic phenomena and the trilemma in the high-density magnetic storage,therefore,how to break through the bottleneck of existing magnetic storage technology and make the magnetic storage area density to ultra-high density level is a hot research area.In a variety of technical solutions,the exchange coupling composite media technology can reduce the diameter of the storage grains while maintaining the thermal stability so as to directly increase the surface density of the magnetic storage,therefore,the study of exchange coupled composite media technology has a high value.The exchange coupling effect in the exchange coupled composite media has a great influence on the coercivity of the medium and the reversal of the grain magnetization direction when the information is written.Firstly,it analyzes the effect of exchange coupling on the particles of single exchange coupled composite media,and finds that the exchange coupling effect can significantly reduce the coercivity of magnetic grains;at the same time,the volume parameters of the individual grains of the exchange coupled composite media which satisfy the ultra-high density magnetic storage requirement are analyzed;then,the effect of the exchange coupling between the grains and the distance between the grains on the coercivity of the media in the continuous exchange coupled composite media was analyzed,it is found that the exchange coupling effect of the soft magnetic layer between the grains has the greatest influence on the coercivity of the whole media,and it is found that the larger the grain’s spacing is,the smaller the coupling effect between the grain,and the coercivity of the whole media is larger;after this,the effect of the distance between the grains and the exchange coupling between the grains on the media coercivity and the magnetization direction’s reversal when the information is written was analyzed,it was found that the larger the particle spacing,the smaller the coupling effect between the grains,the smaller the coercivity of the writing grains,and the easier the direction of the magnetization of the writing grains;finally,the additional simulation results of continuous exchange coupled media with voronoi structure are used to verify the correctness of the simulation results of continuous exchange coupling media with rectangular structure.The research results have great theoretical and practical value in the design and preparation of exchange coupled composite media in ultra-high density magnetic storage.