Date: Monday, June 25, 2012
Time: 10:30 - 11:30
Place: 7th floor small seminar room, Sengen
Areal density of hard dick drive soon faces limit due to various challenges
of TMR materials for further reduction of size. With given geometry of
current-perpendicularplane, alternative candidate for read sensor technology
to overcome the drawbacks of TMR and CPP GMR with transition metal is the
CPP GMR utilizing Heusler alloy (HA). This all metallic sensor stack with
low resistance resolves possible issue of noise anchoring TMR technology.
And the half metallic nature of HA boosts the signal output beyond the
CPP GMR with transition metals. In order to be accommodated in the sensor
stack in the order of 30nm and lower, it is highly critical to prepare
ordered phase of HA with given thermal processing allowed in sensor stack
fabrication. Furthermore, proper metrology is required to obtain the phase
information from very thin HA. In the talk, NMR as a proper metrology to
provide phase information is suggested among various analytical techniques.