Evidence for a Magnetic Proximity Effect up to Room Temperature at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Fe</mml:mi><mml:mo>/</mml:mo><mml:mo stretchy="false">(</mml:mo><mml:mi>Ga</mml:mi><mml:mo>,</mml:mo><mml:mi>Mn</mml:mi><mml:mo stretchy="false">)</mml:mo><mml:mi>As</mml:mi></mml:math>Interfaces