journal article·2020-12-30

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

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

ACS Applied Materials & Interfaces· Volume 12· Issue 52
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Abstract

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.
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Research context

OpenAlex topics: 2D Materials and Applications · Chalcogenide Semiconductor Thin Films · High-pressure geophysics and materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Materials Science and Engineering, UNSW, Sydney, New South Wales 2052, Australia

Australian Centre for Microscopy & Microanalysis, and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia

School of Energy and Power Engineering, Wuhan University of Technology, Wuhan, Hubei 430063, China

National Isotope Centre, GNS Science, P.O. Box 31312, Lower Hutt 5010, New Zealand

Department of Materials Science and Engineering, National University of Singapore, 119260, Singapore

Institute of Chemical and Engineering Sciences, A*STAR, 1 Pesek Road, Jurong Island, 627833, Singapore

SIMS Facility, Office of the Deputy-Vice Chancellor (Research and Development), Western Sydney University, Locked Bag 1797, Penrith, New South Wales 2751, Australia

School of Science, RMIT University, Melbourne, Victoria 3001, Australia

Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia

Global Innovative Centre for Advanced Nanomaterials, School of Engineering, The University of Newcastle, Callaghan, New South Wales 2308, Australia

Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an 710069, China

Funding

Australian Research Council

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