MAGNETIC-PROPERTIES OF THE ICOSAHEDRAL PHASE OF TI TRANSITION-METAL ALLOYS

We report the magnetic properties of the icosahedral phase (i phase) in rapidly quenched Ti-Mn based alloys. Ribbons of i-phase samples of composition Ti61Mn37Si2, Ti61Mn22Cr15Si2, Ti61Mn22Fe15Si2, and Ti61Mn22Co15Si2 were prepared by melt spinning onto a copper disk in an argon atmosphere. Low-field magnetization data reveal a ferromagnetic ordering at T(c) congruent-to 40 K for Ti61Mn37Si2 samples. A partial substitution of Mn by Cr enhances T(c) to 58 K with large thermal hysteresis, whereas samples of composition Ti61Mn22Fe15Si2 show no long-range magnetic ordering down to 4 K. We have found that the sample Ti61Mn22Co15Si2 shows evidence of spin-glass behavior below 15 K.