Large exchange bias effect in the super spin glass state of Mn 50 Ni 38 Al 12 alloy

Observation of giant exchange bias effect in Ni–Mn–Ti all-d-metal Heusler alloy

“…The more rapid cooling of the sample, quenching at liquid N 2 , may be the reason to achieve giant EB in the present system [18]. H EB is observed to exhibit a monotonic decrease with increasing temperature and becomes almost zero above 25 K, whereas H C diminishes to zero at 35 K. Similar observations are observed in other EB systems [33,34]. The decrease of H EB with increasing temperature is associated with the reduction of anisotropy of pinning phase with temperature.…”

“…where, H L , H H are the left and right cut-off field at which magnetization becomes zero. Remarkably, H EB possesses a giant value of around 3.68 kOe at 2 K, which is around 3.1 times of Ni-Mn-Ti thin film [30] (H EB ∼ 1.2 kOe) and it is also very rare in Ni-Mn based alloys and thin films [9,20,[31][32][33].…”

Exchange-bias via nanosegregation in novel Fe2−xMn1+xAl (x = −0.25, 0, 0.25) Heusler films

“…25,26 These conditions occur in Mn-based Heusler alloys that present the shape memory effect, [27][28][29][30][31][32][33][34][35] compensated ferrimagnetism 36 and spin glass behaviour. 21,37,38 The observation of exchange-bias in nominally single Heusler alloys is intriguing for spintronic devices because of their highly spin-polarized conduction band. [39][40][41][42] The Heusler alloy Fe 2 MnAl is promising for application in environmentally friendly spin valve devices because it is ferromagnetic at room temperature, 43,44 it is made of abundant nonhazardous materials and can be prepared as core/shell nanoparticles that display exchange-bias.…”

Tuning the exchange bias effect via thermal treatment temperature in bulk Ni50Mn42In3Sb5 Heusler alloys

“…10) For example, Pan et al reported a giant conventional exchange bias (CEB) field of 5.3 kOe in the SSG Mn 50 Ni 38 Al 12 bulk Heusler alloy after field cooling (FC) under 3 T at 2 K, which is contributed to the enhanced AFM and the corresponding pinning effect. 11) Wang et al obtained a large spontaneous exchange bias (SEB) in bulk Ni-Mn-In Heusler alloys, due to the formation of super ferromagnetic unidirectional anisotropy during the initial magnetization process. 12) Apparently, the type and behavior of spin glass state at low temperatures is one of the important factors generating and affecting the EB effect.…”