Magnetotransport and electronic noise in superparamagnetic magnetic tunnel junctions

被引：13
作者：
Zhang, Yiou [1 ]
He, Guanyang [1 ]
Zhang, Xixiang [2 ]
Xiao, Gang [1 ]
机构：
[1] Brown Univ, Dept Phys, Providence, RI 02912 USA
[2] King Abdullah Univ Sci & Technol, Div Phys Sci & Engn, Thuwal 239955, Saudi Arabia
来源：
APPLIED PHYSICS LETTERS | 2019年 / 115卷 / 02期
关键词：
SENSORS;
D O I：
10.1063/1.5110715
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We have investigated the magnetotransport and noise properties of magnetic tunnel junctions incorporating a superparamagnetic free layer, in a wide temperature range from 150K 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/root Hz 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. Published under license by AIP Publishing.
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页数：4
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