Giant exchange bias effect in Ruddlesden-Popper oxides SrLaFe0.25+xMn0.25Co0.5−xO4 (x=0,0.25): Role of the cluster glass magnetic phase in a quasi-two-dimensional perovskite - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B Année : 2020

Giant exchange bias effect in Ruddlesden-Popper oxides SrLaFe0.25+xMn0.25Co0.5−xO4 (x=0,0.25): Role of the cluster glass magnetic phase in a quasi-two-dimensional perovskite

Résumé

Structural and magnetic studies on SrLa(Fe 0.25 Mn 0.25)Co 0.5 O 4 (FMC1) and SrLaFe 0.5 (Mn 0.25 Co 0.25)O 4 (FMC2) reveal unusually large exchange bias behavior in these atomically disordered quasi-two-dimensional layered perovskites. Powder x-ray as well as neutron diffraction confirm tetragonal crystal structure with I4/mmm space group for both the compounds. Magnetization measurements on FMC1 as well as FMC2 reveal short-range antiferromagnetic ordering around room temperature and frozen magnetic clusters at lower temperatures (T < 23 K for FMC1 and T < 43 K for FMC2). The random occupancy of mixed-valent magnetic ions (Fe 3+ /Fe 4+ , Mn 3+ /Mn 4+ , Co 2+ /Co 3+) at the perovskite octahedral sites give rise to locally varying competing antiferromagnetic and ferromagnetic exchange interactions, resulting in low temperature frozen spin states. Giant exchange bias values of ∼6 and ∼9.5 kOe were observed for FMC1 and FMC2, respectively, at 2 K under an applied field of 50 kOe. In comparison, the Co-rich FMC1 exhibits higher magnetization and coercivity, whereas Fe-rich FMC2 possesses a higher exchange bias effect. Our experimental results reveal compositional tuning induced exotic magnetic behavior in quasi-two-dimensional layered oxides.
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Dates et versions

hal-04147068 , version 1 (30-06-2023)

Identifiants

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Anusree V. K, Ranjana R Das, P Neenu Lekshmi, Ramchandra Dhal, Claire Colin, et al.. Giant exchange bias effect in Ruddlesden-Popper oxides SrLaFe0.25+xMn0.25Co0.5−xO4 (x=0,0.25): Role of the cluster glass magnetic phase in a quasi-two-dimensional perovskite. Physical Review B, 2020, 102 (13), pp.134405. ⟨10.1103/physrevb.102.134405⟩. ⟨hal-04147068⟩

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