Nguyen, Hoang Yen Thi Joo, Sung-Jung Jung, Kuyoul Shin, Kyung-Ho 2024-01-21T01:35:51Z 2024-01-21T01:35:51Z 2021-09-05 2007-01 1533-4880 https://pubs.kist.re.kr/handle/201004/134785 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. English AMER SCIENTIFIC PUBLISHERS MAGNETIC TUNNEL-JUNCTIONS POLARIZED CURRENT MULTILAYER EXCITATION Field dependence of switching currents in an exchange biased spin valve Article 10.1166/jnn.2007.021 1 JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.7, no.1, pp.344 - 349 JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 7 1 344 349 scie scopus 000243057900031 2-s2.0-34447303582 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article 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