Awarded three Orders of Lenin, two Orders of the Red Star, the Order of the Red Banner of Labour, two Orders of the Badge of Honour, and the S. I. Vavilov Gold Medal. From 1947, he worked continuously at the Institute of Metal Physics of the USSR Academy of Sciences: head of department, from 1950 — deputy director of the institute, from 1953 — head of laboratory, from 1993 — chief research fellow.
S. V. Vonsovsky's works are devoted to quantum theory of solids, multi-electron theory of metals and semiconductors, theory of ferro- and antiferromagnetism, and superconductivity. In 1941, he developed a method for creating magnetic texture in ferromagnets through thermomechanical processing. He created new technical magnetic materials. He is the author of more than 170 scientific papers and 8 monographs, the main ones being: «Ferromagnetism» (1948, co-authored with Y. S. Shur), «Modern Theory of Magnetism» (1953), «Magnetism» (1971), «Superconductivity of Transition Metals, Their Alloys and Compounds» (1977), «Quantum Physics of Solids» (1983).