Effects of the semi-classical properties of the electrons’ spin on the growth rate of the temperature anisotropy electromagnetic instabilities, is shown in plasma systems. The ob- tained results lead to new properties of the instability in the system, where the instabil- ities will be purely growing without any oscillation and damping. In fact, it is expected that, the semi-classical properties of the electrons’ spin lead to generating a free energy in the systems, so that, the non resonant instabilities will be present even in the absence of the temperature anisotropy. In that case, the particles are able to transmit easily from the magnetic tails.
