Magnetic reversal and thermal stability of CoFeB perpendicular magnetic tunnel junction arrays patterned by block copolymer lithography

by / Thursday, 24 May 2018 / Published in

Magnetic reversal and thermal stability of CoFeB perpendicular magnetic tunnel junction arrays patterned by block copolymer lithography


Published in: Nanotechnology, 29, 27
2018/07/06
Publisher URL: http://iopscience.iop.org/article/10.1088/1361-6528/aabce8/meta
DOI: https://doi.org/10.1088/1361-6528/aabce8 Authors:
Kun-Hua Tu Eduardo Fernández Hamid Almasi Weigang Wang D. Navas Konstantinos Ntetsikas Dimitrios Moschovas Apostolos Avgeropoulos C. A. Ross
Abstract:

Dense arrays of pillars, with diameters of 64 and 25 nm, were made from a perpendicular CoFeB magnetic tunnel junction thin film stack using block copolymer lithography. While the soft layer and hard layer in the 64 nm pillars reverse at different fields, the reversal of the two layers in the 25 nm pillars could not be distinguished, attributed to the strong interlayer magnetostatic coupling. First-order reversal curves were used to identify the steps that occur during switching, and the thermal stability and effective switching volume were determined from scan rate dependent hysteresis measurements.

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