Field dependence of switching currents in an exchange biased spin valve

Authors
Nguyen, Hoang Yen ThiJoo, Sung-JungJung, KuyoulShin, Kyung-Ho
Issue Date
2007-01
Publisher
AMER SCIENTIFIC PUBLISHERS
Citation
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.7, no.1, pp.344 - 349
Abstract
Current induced magnetic reversal due to spin transfer torque is a promising candidate in advanced information storage technology It has been intensively studied. This work reports the field-dependence of switching-currents for current induced magnetization switching in a uncoupled nanosized cobalt-based spin valve of exchange biased type. The dependency is investigated in hysteretic regime at room temperature, in comparison with that of a trilayer simple spin valve. In the simple spin valve, the switching currents behave to the positive and the negative applied magnetic field symmetrically. In the exchange biased type, in contrast, the switching currents respond to the negative field in a quite unusual and different manner than to the positive field. A negative magnetic field then can shift the switching-currents into either negative or positive current range, dependently on whether a parallel or an antiparallel state of the spin valve was produced by that field. This different character of switching currents in the negative field range can be explained by the effect of the exchange bias pinning field on the spin-polarizer (the fixed Co layer) of the exchange biased spin valve. That unidirectional pinning filed could suppress the thermal magnetization fluctuation in the spin-polarizer, leading to a higher spin polarization of the current, and hence a lower switching current density than in the simple spin valve.
Keywords
MAGNETIC TUNNEL-JUNCTIONS; POLARIZED CURRENT; MULTILAYER; EXCITATION; MAGNETIC TUNNEL-JUNCTIONS; POLARIZED CURRENT; MULTILAYER; EXCITATION; spin transfer torque; current induced magnetization switching; nano-scaled CPP-exchange biased spin valves; spin memory devices; magnetoresistive storage devices
ISSN
1533-4880
URI
https://pubs.kist.re.kr/handle/201004/134785
DOI
10.1166/jnn.2007.021
Appears in Collections:
KIST Article > 2007
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