Tuning the austenite and martensite phase fraction in ferromagnetic shape memory alloy ribbons of Ni45Co5Mn38Sn12

Abstract

The ferromagnetic shape memory alloy ribbons with composition Ni45Co5Mn38Sn12 are shown to have field induced kinetically arrested ferromagnetic austenite phase down to the low temperature due to hindered martensite transformation. This gives rise to the coexisting martensite and austenite phases in a wide range of temperature and field. Here, we show a systematic rise in arrested austenite phase with the reduction in martensite phase quantitatively by various magnetization measurements. The fraction of these coexisting phases can be tuned in “field-temperature” space. Further, we show that the “domain” of tunability varies with temperature.

Properties and Decomposition of Heusler Alloys

“…Superparamagnetic and superspin‐glass behavior have also been observed in Ni 50− x Co x Mn 39 Sn 11 (0≤ x ≤10), where the superparamagnetic state is formed by magnetic clusters distributed in a weak magnetic matrix, which has directly been confirmed by small‐angle neutron scattering . For completeness, we give reference to the work of Kainuma's and Chaddah's groups who performed experiments like those shown in Figure some years before for Ni–Co–Mn–In alloys (see Figure ) . As in Figure , Figure shows results of rapidly quenched samples.…”

“…[ some years before for Ni-Co-Mn-In alloys (see Figure 6). [32][33][34][35][36][37] As in Figure 5, Figure 6shows results of rapidly quenched samples.…”

Effect of thermal cycle on the interfacial antiferromagnetic spin configuration and exchange bias in Ni-Mn-Sb alloy

“…Actually, the magnetostructural transition can be kinetically arrested in the presence of high magnetic field, and further induced by decreasing field and heating. [14][15][16] In our opinion, the increase of AFM spins can give us an opportunity to study the relation between EB and the microscopic domain structure. In this paper, we study the effect of thermal cycle on the interfacial AFM spin configuration and EB effect in Ni-Mn-Sb alloy.…”

Tuning exchange bias through zero field cooling from different remanent states above blocking temperature in Ni50Mn36Sb14 alloy

“…Different from the double shifted hysteresis loops in ZFC mode, the hysteresis loop in FC mode usually is a single shifted loop in high cooling field, indicating the formation of single FM domain structure in the Ni–Mn base alloys. Also, H EB decreases with increase of the large cooling field, which can be attributed to the growth of FM exchange interaction 15, 22 associated with the kinetic arrest of MT 23–25. Hence, the role of the cooling field is not only to induce a single FM domain state above T B but also to tune the fractions of FM and AFM interactions through MT.…”