Fig. 2: Schematics of the geometry of the different spin-relaxation contributions for B⊥ (upper panel) and B∥ (lower panel).
From: Ultralong 100 ns spin relaxation time in graphite at room temperature
Note that spins precess around the magnetic field for both orientations. The respective spin-relaxation rates are caused by the fluctuating components which are perpendicular to the given direction. For the B∥, it consists of two contributions due to the Larmor precession of the spins.
