| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1591143 | Solid State Communications | 2016 | 6 Pages |
•A large zero-field cooled exchange-bias effect was observed in Ni50Mn35Fe2In13.•A non-monotonic behavior of spontaneous HEB appears in Ni50Mn35Fe2In13.•The maximal value of GMR reaches −57% under ΔH=50 kOe in Ni50Mn33Fe4In13.
In the present work, we have obtained a large zero-field cooled exchange-bias (spontaneous exchange bias, SEB) in Ni50Mn35Fe2In13 Heusler alloy. The experimental results indicate that the sample with x=2 exhibits super-spin glass (SSG), super-paramagnetic (SPM), super-ferromagnetic (SFM) and antiferromagnetic (AFM) behaviors in the martensite state at low temperature. Contributing to the complex magnetic interactions, a large SEB effect with the value of 1567 Oe was obtained at 5 K. At the same time, a non-monotonic behavior of spontaneous exchange bias field (spontaneous HEB) was observed with the variation of temperature, which is resulted from the competition between the volume fraction of SFM clusters and the exchange coupling of the SFM–AFM interface. In addition, during martensitic transformation (MT), extraordinary electrical transport properties of Ni50Mn37−xFexIn13 (x=2–4) alloys have been observed under various external magnetic field. The maximal value of the giant magnetoresistance (GMR) reaches about 57% at 135 K under the external magnetic field change of 50 kOe. The effect of field induced reverse martensitic transformation (FIRMT) on the GMR has been also discussed.
