Abstract:
:A spontaneous exchange bias (SEB) discovered by Wang et al. [Phys. Rev. Lett. 106 (2011) 077203.] after zero-field cooling (ZFC) has attracted recent attention due to its interesting physics. In this letter, we report a giant SEB tuned by Sb-doping in Ni50Mn38Ga12-xSbx Heusler alloys. Such an SEB was switched on below the blocking temperature of approximately 50 K. The maximum exchange bias HE can arrive at 2930 Oe in a Ni50Mn38Ga10Sb2 sample after ZFC to 2 K. Further studies showed that this SEB was attributable to interaction of superspin glass (SSG) and antiferromagnetic matix, which was triggered by the crossover of SSG from canonical spin glass to a cluster spin glass. Our results not only explain the underlying physics of SEB, but also provide a way to tune and control the SEB performance.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Tian F,Cao K,Zhang Y,Zeng Y,Zhang R,Chang T,Zhou C,Xu M,Song X,Yang Sdoi
10.1038/srep30801subject
Has Abstractpub_date
2016-08-01 00:00:00pages
30801issn
2045-2322pii
srep30801journal_volume
6pub_type
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