Nanometer scale spintronic sensors and memories

Nanometer scale spintronics for data storage applications in both hard disk drive and non-volatile memory are introduced. For the hard disk drive applications, we have developed all-metal GMR sensors with an MR of 18%. A reader with a track width of 109nm is also fabricated. Linear and noise-free output signal has been achieved. For non-volatile memory applications, an MTJ MRAM with switch-free, two-line structure and a peripheral circuitry is presented. The shunting effect has been effectively reduced in this structure; the signal is maintained at original level even without the requirement of a transistor or a diode. The additional digital line to write the cell is removed without affecting the writing performance.