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Colossal Magnetization and Giant Coercivity in Ion-Implanted (Nb and Co) MoS2 Crystals

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journal contribution
posted on 16.12.2020, 13:03 by Sohail Ahmed, Xiang-Yuan Carl Cui, Xiang Ding, Peter Paul Murmu, Nina Bao, Xun Geng, Shibo Xi, Rong Liu, John Kennedy, Tom Wu, Lan Wang, Kiyonori Suzuki, Jun Ding, Xueze Chu, Sathish Russellraj Clastinrusselraj Indirathankam, Mingli Peng, Ajayan Vinu, Simon Peter Ringer, Jiabao Yi
Colossal saturation magnetization and giant coercivity are realized in MoS2 single crystals doped with Nb and/or Co using an ion implantation method. Magnetic measurements have demonstrated that codoping with 2 at % Nb and 4 at % Co invoked a “giant” coercivity, as high as 9 kOe at 100 K. Doping solely with 5 at % Nb induces a “colossal” magnetization of 1800 emu/cm3 at 5 K, which is higher than that of metallic Co. The high magnetization is due to the formation of Nb-rich defect complexes, as confirmed by first-principles calculations. It is proposed that the high coercivity is due to the combined effects of strong directional exchange coupling induced by the Nb and Co doping and pinning effects from defects within the layered structure. This high magnetization mechanism is also applicable to 2D materials with bilayers or few layers of thickness, as indicated by first-principles calculations. Hence, this work opens a potential pathway for the development of 2D high-performance magnetic materials.