SURFACE-EXCHANGE MODES IN FERROMAGNETIC PARTICLES AND THIN FILMS G. HEBER, F. GOEDSCHE, E. HEINER, J. MONECKE et H. WENZELJ. Phys. Colloques, 32 C1 (1971) C1-1165-C1-1167DOI: https://doi.org/10.1051/jphyscol:19711417