Transport Properties of Antiferromagnetic Tunneling Junctions*

We study a ferromagnetic-antiferromagnetic-normal metal tunneling junction using non-equilibrium Green's function techniques and derive microscopic formulae for various types of spin torque as well as charge and spin conductance. Relative strength of the torques and their dependence on control parameters such as the tunneling probabilities to the two leads are presented. We also discuss dynamical consequences of the different torques. Charge and spin transmission is shown to depend on the angle between the ferromagnetic and antiferromagentic order parameters. We suggest potential applications of these angular dependences.