Feasibility of Differential Dual Spin Valve for 10 ${\rm Tb/in}^{2}$

A conventional read head with the sensor embedded between two magnetic shields would hit the wall to provide a resolution required for a bit length less than 10 nm. A differential dual spin valve (DDSV) is proposed as an alternative for recording density of 10 Tb/in2. Our simulation results show that a DDSV can work well for a bit length down to 4 nm without magnetic shields. An excellent differen...