Magnetotransport and electronic noise in superparamagnetic magnetic tunnel junctions | Zendy

Yiou Zhang | Zendy; Guanyang He | Zendy; Xixiang Zhang | Zendy; Gang Xiao | Zendy

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Magnetotransport and electronic noise in superparamagnetic magnetic tunnel junctions

Author(s) -

Yiou Zhang,

Guanyang He,

Xixiang Zhang,

Gang Xiao

Publication year - 2019

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.5110715

Subject(s) - superparamagnetism , nanoclusters , condensed matter physics , materials science , ferromagnetism , noise (video) , scaling , atmospheric temperature range , scaling law , magnetization , nanotechnology , physics , magnetic field , thermodynamics , quantum mechanics , geometry , mathematics , artificial intelligence , computer science , image (mathematics)

We 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.We 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.

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