Low frequency noise in asymmetric double barrier magnetic tunnel junctions with a top thin MgO layer

Guo Hui-Qiang^a), Tang Wei-Yue†^a), Liu Liang^b),^c), Wei Jian‡^b),^c), Li Da-Lai^d), Feng Jia-Feng^d), Han Xiu-Feng^d)

(a) Magnetoresistance (MR) curve in DBMTJs at 3.6 K with one very thin top barrier, resulting in the coupling between the top and central magnetic layers. The magnetic states from right to left are P(↑ ↑↑), AP1^r(↑ ↓↑), AP2(↑ ↑↓), AP1(↓ ↑↓), and P′ (↓ ↓↓), respectively. (b) Static MR at room temperature with different θ between the easy axis and the external magnetic field. The blue arrow indicates the field sweeping direction.