Research Papers in Physics and Astronomy


Date of this Version



Published in Microsc. Microanal. 8 (Suppl. 2), 2002. Copyright © Microscopy Society of America 2002. Used by permission.


In current extremely high density recording media design, the signal to noise ratio SNR is related to the number of magnetic grains N in a recording bit by
SNR = 10 logl0 N .................................... (1)
In earlier studies we have found that a metallurgical grain can act as a magnetic grain when grains are magnetically decoupled by a non-magnetic phase [1,2]. Alternatively, several metallurgical grains can be exchange-coupled together when they are small [3]. An ideal morphology is one in which the non-magnetic atoms are segregated at the grain boundaries forming the non-magnetic phase while keeping the grains closely packed.

Included in

Physics Commons