def fn_S_V_p_magnetization(omega, T_2, mu_N, n_N, l, a, b):
    """Voltage noise power originating from transverse magnetization fluctuations as referred to primary circuit, as a function of:
    -- angular frequency omega
    -- transverse spin coherence time T_2
    -- nuclear magnetic moment mu_N
    -- nuclear spin number density n_N
    -- crystal thickness l = l_1
    -- transverse aspect ratios a = l_2 / l_1 and b = l_3 / l_1.
    """
    A = l**2 * a * b
    Vol = l * A
    return (1/8) * mu_N**2 * n_N * Vol**(-1) * T_2**(-1) * A**2 * omega**0