Magnetotransport and electronic noise in superparamagnetic magnetic tunnel junctions
KAUST DepartmentMaterials Science and Engineering
Materials Science and Engineering Program
Physical Sciences and Engineering (PSE) Division
Embargo End Date2020-07-08
Permanent link to this recordhttp://hdl.handle.net/10754/656209
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AbstractWe have investigated the magnetotransport and noise properties of magnetic tunnel junctions incorporating a superparamagnetic free layer, in a wide temperature range from 150 K to 400 K. Both 1/f noise and sensitivity reach the maximum near the blocking temperature of the superparamagnetic transition. The smooth change of noise around the blocking temperature is attributed to size distribution of nanoclusters comprising the free layer. The best detectability (40 nT / H z at 1 Hz) is achieved at 350 K. In ferromagnetic and superparamagnetic states, 1/f noise follows different scaling relations with respect to sensitivity. The change of scaling law is explained by thermodynamics of the nanoclusters.
SponsorsThis work was supported by the King Abdullah University of Science and Technology (KAUST) through the Sensor Initiative.
JournalApplied Physics Letters