Sublattice spin reversal and field induced Fe 3+ spin-canting across the magnetic compensation temperature in Y 1.5 Gd 1.5 Fe 5 O 12 rare-earth iron garnet.

In the present work Fe\textsuperscript{3+} sublattice spin reversal and Fe\textsuperscript{3+} spin-canting across the magnetic compensation temperature (T\textsubscript{Comp}) are demonstrated in polycrystalline Y\textsubscript{1.5}Gd\textsubscript{1.5}Fe\textsubscript{5}O\textsubscript{12} (YGdIG) by means of in-field $^{57}Fe$ M$\ddot{o}$ssbauer spectroscopy measurements. Corroborating in-field $^{57}Fe$ M$\ddot{o}$ssbauer measurements, both Fe\textsuperscript{3+} \& Gd\textsuperscript{3+} sublattice spin reversal has also been manifested in hard x-ray magnetic circular dichroism (XMCD) measurements. From in-field $^{57}Fe$ M$\ddot{o}$ssbauer measurements, estimation and analysis of effective internal hyperfine field (H\textsubscript{eff}), relative intensity of absorption lines in a sextet elucidated unambiguously the signatures of Fe\textsuperscript{3+} spin reversal and field induced spin-canting of Fe\textsuperscript{3+} sublattices across T\textsubscript{Comp}. Gd L\textsubscript{3}-edge XMCD signal is observed to consist of an additional spectral feature, identified as Fe\textsuperscript{3+} magnetic contribution to XMCD spectra of Gd L\textsubscript{3}-edge, enabling us the extraction of both the sublattices (Fe\textsuperscript{3+} \& Gd\textsuperscript{3+}) information from a single absorption edge analysis. The evolution of the XMCD amplitudes, which is proportional to magnetic moments, as a function of temperature for both magnetic sublattices extracted at the Gd L\textsubscript{3}-edge reasonably match with values that are extracted from bulk magnetization data of YGdIG and YIG (Y\textsubscript{3}Fe\textsubscript{5}O\textsubscript{12}) and corresponding Fe K-edge XMCD amplitudes for Fe contribution. These measurements pave new avenues to investigate how the magnetic behavior of such complex system acts across the compensation point.