Title :
Spin torque induced noise effect in TMR head
Author :
Kim, Eunsik ; Lee, S.C. ; Sunwoo, Kuk-Hyun
Author_Institution :
Samsung Adv. Inst. of Technol., Yongin
Abstract :
Recently hard disk drive (HDD) industry introduced a new hard disk drive (HDD) which adapted the perpendicular magnetic recording (PMR) media and tunneling magnetic resistance (TMR) head technology. TMR with MgO barriers has increased magnetoresistance (MR) ratio up to 230%. This increased sensitivity may amplify the noise effect. Also the sensing current which flows perpendicular in plane (CPP) direction can give the spin torque effect to the free layer and become an another noise source. This effect might be small in this current size TMR head, but could be an important noise source when the size of head is decrease with increasing the areal density.
Keywords :
disc drives; hard discs; perpendicular magnetic recording; torque; tunnelling magnetoresistance; hard disk drive; noise source; perpendicular magnetic recording; spin torque induced noise effect; tunneling magnetic resistance head technology; Acoustical engineering; Hard disks; Magnetic heads; Magnetic hysteresis; Magnetic noise; Magnetic tunneling; Magnetization; Perpendicular magnetic recording; Torque; Tunneling magnetoresistance;
Conference_Titel :
Nanotechnology Materials and Devices Conference, 2006. NMDC 2006. IEEE
Conference_Location :
Gyeongju
Print_ISBN :
978-1-4244-0540-4
Electronic_ISBN :
978-1-4244-0541-1
DOI :
10.1109/NMDC.2006.4388921
