A rotor assembly is presented for a turbine engine with gas bearings including a solid permanent magnet with no central bore. The rotor assembly also includes a first shaft having at least one bearing intended for engaging with a support bearing to form a gas bearing and ensure rotational guidance of the first shaft as well as a thrust disk. The solid permanent magnet is press-fitted inside a band made of a nonmagnetic material, the band is integral with the first shaft in an extension thereof, and a second shaft has at least one bearing intended for engaging with a support bearing to form a second gas bearing and ensure rotational guidance of the second shaft, coaxially with the first shaft such that the first shaft, the band, and the second shaft form an integral assembly.