Heavy rare-earth-based quaternary double perovskite with the formula $R_{2}B{B}^{\prime }{\mathrm{O}}_6$ has attracted great attention due to its multiple magnetic exchange interactions, intriguing type of magnetic ordering, and antisite disorder. In this work, magnetic behaviors, magnetic-field-assisted switching effect, and associated exchange interactions in Mn self-doped double perovskites $\mathrm{G}{\mathrm{d}}_2\mathrm{N}{\mathrm{i}}_{2-x}\mathrm{M}{\mathrm{n}}_x{\mathrm{O}}_6 (1.0\le x\le 1.6)$ are investigated by using different protocols of DC and AC magnetic measurements. Experiments indicate that negative magnetization effects characterized by $M_{\mathrm{FC}}<0$ under moderate positive magnetic fields are observed from $x=1.3$ up to $x=1.5$. The repeatability of $M$($T$) under different magnetic fields and its mirror symmetry about the temperature axis under $\pm H_{\mathrm{cool}}$ signify the intrinsic nature of the effect. The manipulability of magnetization polarity is demonstrated by the magnetic-field-assisted switching effect, indicating promising application prospects in spintronics devices. The simultaneous decrease of both $M_{\mathrm{FC}}$ and transition temperature $T_{\mathrm{C}}$ by Mn self-doping suggests the weakening of $\mathrm{N}{\mathrm{i}}^{2+}\text{−}\mathrm{M}{\mathrm{n}}^{4+}$ ferromagnetic interaction due to the increase in antisite disorder, which is considered as a triggering factor of the negative magnetization. Therefore, the observed effect is regarded as arising from the negative exchange coupling between $\mathrm{G}{\mathrm{d}}^{3+}$ and $\mathrm{N}{\mathrm{i}}^{2+}/\mathrm{M}{\mathrm{n}}^{4+}$ local sublattice moments, which have different temperature dependence according to the Néel molecular field theory.

Close

PrevNext

View figure in article

• Demagnetization
• Doping effects
• High magnetic fields
• Magnetic anisotropy
• Magnetic coupling
• Magnetic interactions
• Magnetic order
• Magnetic phase transitions
• Magnetic susceptibility
• Spintronics
• Transition temperature