How to use the micromagneticmodel.Slonczewski function in micromagneticmodel

msg = f'Cannot use {type(driver.evolver)} for evolver.'
            raise TypeError(msg)

        # Extract dynamics equation parameters.
        if mm.Precession() in system.dynamics:
            driver.evolver.gamma_G = system.dynamics.precession.gamma0
        else:
            driver.evolver.do_precess = 0
        if mm.Damping() in system.dynamics:
            driver.evolver.alpha = system.dynamics.damping.alpha
        else:
            driver.evolver.alpha = 0
        if mm.ZhangLi() in system.dynamics:
            driver.evolver.u = system.dynamics.zhangli.u
            driver.evolver.beta = system.dynamics.zhangli.beta
        if mm.Slonczewski() in system.dynamics:
            driver.evolver.J = system.dynamics.slonczewski.J
            driver.evolver.mp = system.dynamics.slonczewski.mp
            driver.evolver.P = system.dynamics.slonczewski.P
            driver.evolver.Lambda = system.dynamics.slonczewski.Lambda
            driver.evolver.eps_prime = system.dynamics.slonczewski.eps_prime

        mif += oc.scripts.evolver_script(driver.evolver)

        # Extract time and number of steps.
        t, n = kwargs['t'], kwargs['n']

        # TimeDriver
        mif += '# TimeDriver\n'
        mif += 'Specify Oxs_TimeDriver {\n'
        mif += '  evolver :evolver\n'
        mif += '  mesh :mesh\n'