Giant room temperature exchange bias effect in “314-type” cobaltate SrCo1−xVxO3−δ (x = 0.05, 0.1)

Abstract

Abstract Materials with room temperature exchange bias (EB) effect are important for future applications in electronics/spintronics industry. Nevertheless, such materials are rare in bulk and show very low exchange bias field (∼100 Oe) at room temperature. In this work, we have shown the appearance of large exchange bias effect in “314-type” SrCo1−xVxO3−δ (x = 0.05 and 0.1) materials. X-ray diffraction patterns confirm that all the samples crystallize in a “314-type” tetragonal structure (space group: I4/mmm) with 2ap × 2ap × 4ap type unit cell. Both the samples exhibit ferrimagnetic-type transitions above room temperature. Detailed magnetic measurements highlight a large exchange bias effect with HEB ∼ 1 kOe at room temperature and HEB ∼ 8.22 kOe at 10 K. The introduction of V5+ in the structure actually breaks the compensated antiferromagnetic (AFM) structure. The existence of nearly compensated host and weakly ordered magnetic regions imparts the exchange bias effect in these samples.