Exchange bias behavior and inverse magnetocaloric effect in Ni50Mn35In15 Heusler alloy

Annealing Effect on Martensitic Transformation and Magneto-Structural Properties of Ni-Mn-In Melt Spun Ribbons

“…6 Mn 34.5 In 14. 9 . In as-quenched alloys austenite crystallizes in the ordered B2-type crystal structure whereas the short annealing performed favors the formation of a highly ordered L2 1 -type structure.…”

“…Below the martensitic transformation temperature the change in the interatomic distances among neighbouring Mn atoms in In sites and those occupying regular Mn sites lead to the strengthening of this AFM coupling. It has been stated in literature that the coexistence of AFM and ferromagnetic (FM) interactions within martensite is macroscopically evidenced by its lower saturation magnetization with respect to austenite, the observed splitting between the ZFC and FC pathways of the temperature dependence of the low-field magnetization [7], and the exchange bias phenomenon reported at low temperatures for these alloys [8,9]. The more abrupt change in magnetization in the thermal region where magnetic transitions occur as well as the observed increase in T C M and T C A must result from the strengthening of FM coupling.…”

“…First it must be noted that both hysteresis loops are shifted along the negative H-axis denoting the occurrence of exchange bias effect [8][9][10], but that of the annealed one shows regular magnetization paths whereas the demagnetizing curve in the second-to-third quadrant for the as-quenched sample shows a welldefined anomaly. The anomaly reveals the existence of an asymmetric magnetization reversal processes.…”

Magnetic-Field-Induced Effects in Martensitic Heusler-Based Magnetic Shape Memory Alloys

“…The observation of exchange bias in Ni-Mn-based martensitic Heuslers ( Jing et al, 2009a;Khan et al, 2007aKhan et al, , 2007bLi et al, 2007;Nayak et al, 2009a) provided strong evidence for the presence of AF interactions in these systems, since such interactions over large spatial extensions coexisting with the FM matrix are required for the effect to be observed at all. Later, diffuse neutron scattering experiments gave clear evidence and confirmed the presence of antiferromagnetic exchange, especially in the martensite state (Section 3.5).…”

Metastability of ferromagnetic Ni–Mn–Sn Heusler alloys

“…This discovery led to further study of other Heusler alloys close in composition to the Ni-Mn-Ga system, such as Ni-Mn-Z, where Z = In, Sn, and Sb [3][4][5][6][7][8][9][10]. Several studies have been devoted to understanding and improving the properties of these alloys for potential applications [11][12][13][14][15][16][17][18].…”