Title: Wafer Scale-Up and Emergence of Ferromagnetism in Superhard Q-Carbon Coatings By Nanosecond Pulsed Laser Irradiation

Authors: Siddharth Gupta, Ritesh Sachan, and Jagdish Narayan

DOI: 10.33599/nasampe/s.19.1395

Abstract: Laser irradiation has opened an exciting new dimension in materials physics by the transient melting of materials and subsequent ultrafast quenching. Such quenching can generate very high temperatures, leading to the formation of metastable materials like Q-carbon and diamond. Since this transformation is undercooling dependent, we control the undercooling by changing thermal conductivity and increasing sp3 content in as-deposited amorphous carbon. The formation of Q-carbon is analyzed using finite-element and ab-initio molecular dynamics simulations. We observe room-temperature ferromagnetism in Q-carbon with 140 Oe coercivity and 20 emug-1 saturation magnetization. As Q-carbon is harder than diamond, it makes an excellent reinforcing component inside the softer matrix in a composite. These nanocomposites consist of densely-packed sp 3-rich Q-carbon (82% sp3), and sp2-rich α-carbon (40% sp3) amorphous phases. The Q-carbon nanocomposites exhibit a hardness of 67 GPa (Young's modulus ~840 GPa), in contrast to the soft α-carbon (hardness ~18 GPa). The soft α-carbon provides lubrication, resulting in low friction and wear coefficients of 0.09 and 1×10−6, respectively. The nanoscale dispersion of hard Q-carbon and soft α-carbon phases in the Q-carbon nanocomposites enhances the toughness of the coatings. We present detailed structure-property correlations to understand enhancement in the mechanical and magnetic properties of Q-carbon based coatings.

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Conference: SAMPE 2019 - Charlotte, NC

Publication Date: 2019/05/20

SKU: TP19--1395

Pages: 17

Price: FREE