MICROSTRUCTURE AND MAGNETIC AFTEREFFECT IN BULK-HARDENED RARE EARTH-COBALT-COPPER BASE PERMANENT MAGNET ALLOYS A. E. RAY, H. MILDRUM, K. STRNAT and R. HARMER J. Phys. Colloques, 32 C1 (1971) C1-554-C1-555 DOI: 10.1051/jphyscol:19711188