Magnetism of the endohedral metallofullerenes<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>M</mml:mi><mml:mi>@</mml:mi><mml:msub><mml:mi mathvariant="normal">C</mml:mi><mml:mn>82</mml:mn></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mo>(</mml:mo><mml:mi>M</mml:mi><mml:mo>=</mml:mo><mml:mi mathvariant="normal">Gd</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="normal">Dy</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math>and the corresponding nanoscale peapods: Synchrotron soft x-ray magnetic circular dichroism and density-functional theory calculations