Single crystalline transition metal oxides are model systems for studying mutual magnetic interactions accross an interface in microscopic detail. In this talk, a study will be presented which employs various types of magnetic dichroism to corroborate the magnetic structure of an antiferromagnet (NiO) coupled to a single crystalline Fe₃O₄ substrate in various crystalline orientations of the interface. A method will be described to use X-Ray Magnetic Linear Dichroism (XMLD) to correctly determine the antiferromagnet’s spin axis orientation. Hereby it is important to take into account the magnetic and crystalline structure.