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Karthik, S. V., Takahashi, Y. K., Ohkubo, T., Hono, K., Ikeda, S., & Ohno, H. (2009). Transmission electron microscopy investigation of CoFeB/MgO/CoFeB pseudospin valves annealed at different temperatures. Journal of Applied Physics, 106(2), 023920. doi:10.1063/1.3182817 
10.1063/1.3182817