Proximity effects in topological insulators

Magnetic Proximity Effect as a Pathway to Spintronic Applications of Topological Insulators.
Ivana Vobornik,Unnikrishnan Manju, Jun Fujii, Francesco Borgatti, Piero Torelli, Damjan Krizmancic, Yew San Hor, Robert J. Cava, and Giancarlo Panaccione
Nano Letters 11, 4079 (2011)

Mn and Fe XMCD hysteresis loops vs temperature for Fe (black) and Mn (red).