Evidence of Surface Spin Glass Like Ordering and Exchange Bias Effect in Phase Separated Sm0.5Ca0.5MnO3 Nanomanganites

摘要: In this article, we report that the charge/orbital order state of bulk antiferromagnetic Sm0.5Ca0.5MnO3 is suppressed and confirms appearance weak ferromagnetism below 65 K followed by a low temperature spin glass (SG) like transition at 41 in its nano metric counterpart. Exchange anisotropy effect has been observed nanomanganites can be tuned strength cooling magnetic field (Hcool). The values exchange bias fields (HE), coercivity (HC), remanence asymmetry (ME) (MC) are found to strongly depend on temperature. HE increases with increasing Hcool but for larger Hcool, tends decrease due growth finite size ferromagnetic clusters. A proposed phenomenological core–shell type model attributed an coupling between spin-glass shell (surrounding) core mainly basis uncompensated surface spins. Results suggest intrinsic phase inhomogeneity effects nanostructured manganites may cause anisotropy, which special interests potential application multifunctional spintronic devices.