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The properties of half-metallic Anti-Ferromagnets are unusual. …… since there is no net internal magnetization, half-metallic Anti-Ferromagnets would not generate a magnetic field, in spite of their fully magnetized currents. This would be a particularly desirable property, for example in spin-polarized Scanning Tunneling Microscopy (STM) , …Currently such experiments are complicated by the existence of a permanent magnetic tip (required to produce the spin-polarized electrons) close to the magnetic surface being investigated.