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- Title
Energy-efficient spin-transfer torque magnetization reversal in sub-10-nm magnetic tunneling junction point contacts.
- Authors
Hong, Jeongmin; Liang, Ping; Safonov, Vladimir; Khizroev, Sakhrat
- Abstract
Spin-transfer torque (STT) magnetization reversal in a magnetic tunneling junction (MTJ), Ta/CoFeB/MgO/CoFeB/Ta, built on the tip of a nanoprobe in a direct contact with a copper substrate is demonstrated in the previously unexplored sub-10-nm diameter range. With the contact resistance of the order of 185 kOhm, the measured magnetoresistance value was 29 %. The average STT reversal current of 95 nA indicated a switching current density of approximately 0.1 MAcm which is more than 30 times smaller than the smallest value reported for STT-MTJs of larger dimensions. An atomistic-scale theory confirmed the experimental result which indicates at least an order of magnitude reduction of the spin damping in the sub-10-nm diameter range.
- Subjects
TORQUE; ELECTRON spin; CHARGE exchange; QUANTUM tunneling; MAGNETIZATION; COPPER; MAGNETORESISTANCE; DAMPING (Mechanics)
- Publication
Journal of Nanoparticle Research, 2013, Vol 15, Issue 4, p1
- ISSN
1388-0764
- Publication type
Academic Journal
- DOI
10.1007/s11051-013-1599-0