Abstract
Materials of Ti doped nanocrystalline SrFeO3-δ were synthesized through solid state reaction. Detailed magnetization measurements were carried out in zero field cooled (ZFC) and field cooled (FC) conditions. Compounds of SrFe1-xTixO3-δ (x = 0.1 to 0.3) are found to be spin glass and parent compound is a helical antiferromagnet. Non magnetic Ti4+ reduces the strength of exchange interactions and the curvature of hysteresis is changed towards concave nature. Exchange bias is observed below the peak temperature (irreversibility in magnetization (TIrr)) in ZFC-FC of SrFe1-xTixO3-δ (x = 0 to 0.3). The coercivity and exchange bias field values are found to be decreases with increase in temperature. Observed exchange bias effect is attributed to competition between antiferromagnetic superexchange and ferromagnetic double exchange interactions.
Highlights
Synthesis of single phase SrFeO3-δ remains challenge and even single crystals are found to have minor amount of secondary phases.[1]
Exchange bias is reported in undoped SrFeO3-δ in[15,16] and this paper reports the exchange bias in SrFe1-xTixO3-δ (x = 0 to 0.3)
Based on AC Susceptibility (ACS), Magnetization and Neutron powder diffraction (NPD) measurements we found that parent compound T0 is helical antiferromagnet and Ti doped samples T1 to T3 are cluster spin glasses and discussed by us.[18,19]
Summary
Synthesis of single phase SrFeO3-δ remains challenge and even single crystals are found to have minor amount of secondary phases.[1] Oxygen vacancy ordering stabilizes SrFeO3-δ in to different crystal structures with δ = 0, 0.125, 0.25 namely cubic, tetragonal, orthorhombic respectively and in between values of δ always yield mixed phases.[2,3,4,5,6] When δ = 0, Fe has only 4+ and for δ = 0, Fe exists in mixed valent state of 3+ and 4+. The crystal symmetry first changes from cubic to tetragonal when δ = 0.125 which is helical antiferromagnet with TN close to 76 K and transforms to an orthorhombic at higher values of δ ≈ 0.25, which is an antiferromagnet with TN = 232 K.7.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
