Besides his discovery of the concepts of antiferromagnetism and ferrimagnetism and its consequences, for which he was awarded the Nobel Prize, Louis.    From Wordnik.com.  [Louis Néel - Biography] Reference

I have particularly emphasised your discoveries of anti-ferro - and ferrimagnetism which have been of such importance in the shaping of modern theories of magnetism.    From Wordnik.com.  [Nobel Prize in Physics 1970 - Presentation Speech] Reference

"for fundamental work and discoveries concerning antiferromagnetism and ferrimagnetism which have led to important applications in solid state physics".    From Wordnik.com.  [Physics 1970] Reference

1970 Nobel Prize awarded to Louis Néel "for fundamental work and discoveries concerning antiferromagnetism and ferrimagnetism which have led to important applications in solid state physics".    From Wordnik.com.  [The Nobel Prize in Physics 2007] Reference