[7p-PB7-1~56] 10 Spintronics and Magnetics（Poster）

[7p-PB7-47] Understanding of the perimeter damage effects for perpendicular 20-nm magnetic tunnel junction using micromagnetic simulation

〇Chikako Yoshida¹, Tomohiro Tanaka¹, Tadashi Ataka¹, Jun Fujisaki¹, Kouichi Shimizu¹, Atsushi Furuya¹, Yuji Uehara¹, Hirotaka Oshima² (1.Fujitsu Ltd., 2.Fujitsu Labs Ltd.)

Keywords:micromagnetic simulation, damaged layer, energy barrier

We investigated the effects of perimeter damage on the energy barrier (Δ) for a perpendicular 20 nm-MTJ using micromagnetic simulation based on the string method. The Δ is changed in response to the coercivity (H_c). The Δ decreases greatly when only the anisotropy field reduced, whereas the Δ showed little change when only the saturation magnetic field decreased. This might be corresponds to the observed H_c reduction in the real MTJ of less than 20 nm.