In the present work $Fe^{ 3+}$ sublattice spin reversal and $Fe^{ 3+}$ spin-canting across the magnetic compensation temperature ($T_{ Comp}$) are demonstrated in polycrystalline $Y_{ 1.5}Gd_{ 1.5}Fe_{ 5}O_{ 12}$ (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 $Fe^{ 3+}$ & $Gd^{ 3+}$ sublattice spin reversal has also been manifested with x-ray magnetic circular dichroism (XMCD) measurement in hard x-ray region. Moreover from in-field $^{ 57}Fe$ M$\ddot{ o}$ssbauer measurements, estimation and analysis of effective internal hyperfine field ($H_{ eff}$), relative intensity of absorption lines in a sextet elucidated unambiguously the signatures of $Fe^{ 3+}$ spin reversal, their continuous transition and field induced spin-canting of $Fe^{ 3+}$ sublattices across $T_{ Comp}$. Further, Fe K- (Gd $L_{ 3}$-) edge XMCD signal is observed to consist of additional spectral features, those are identified from $Gd^{ 3+}$ ($Fe^{ 3+}$) magnetic ordering, enabling us the extraction of both the sublattices ($Fe^{ 3+}$ & $Gd^{ 3+}$) information from a single edge analysis. The evolution of the magnetic moments as a function of temperature for both magnetic sublattices extracted either at the Fe K- or Gd $L_3$-edge agree quite well with values that are extracted from bulk magnetization data of YGdIG and YIG ($Y_{ 3}Fe_{ 5}O_{ 12}$). These measurements pave new avenues to investigate how the magnetic behavior of such complex system acts across the compensation point.
Categories: cond-mat.mtrl-sci