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Micromagnetic simulation assuming a small FePd recording layer (thickness = 2 nm; circular diameter = 10 nm) (a) without Gr and with Gr. Calculation was performed using the string method. (b) The magnetization curves by applying magnetic field to perpendicular direction. (c) The thermal stability factor Δ exceeding 57 implies that an information retention period of more than 10 years can be obtained.
