Interplay of Fe and Tm moments through the spin-reorientation transition inTmFeO3

Abstract

X-ray magnetic circular dichroism (XMCD) and x-ray magnetic linear dichroism (XMLD) have been used to investigate the Fe magnetic response during the spin-reorientation transition (SRT) in TmFeO 3 . Comparing the Fe XMLD results with neutron-diffraction and magnetization measurements on the same sample indicates that the SRT has an enhanced temperature range in the near surface region of approximately 82 to 120 K compared to approximately 82 to 92 K in bulk. This view is supported by complementary resonant soft x-ray-diffraction experiments at the Tm M 5 edge. These measurements find an induced magnetic moment on the Tm sites, which is well described by a dipolar mean-field model originating from the Fe moments. Even though such a model can describe the 4f response in the experiments, it is insufficient to describe the SRT even when considering a change in the 4f anisotropy. Moreover, the results of the Fe XMCD show a different temperature evolution through the SRT, the interpretation of which is hampered by additional spectral shape changes of the XCMD signal.

Electrical detection of the spin reorientation transition in antiferromagnetic TmFeO$_3$ thin films by spin Hall magnetoresistance

“…We note that T I = 72 K and T II = 110 K deviate slightly from the bulk values T 1 = 82 K and T 2 = 94 K. The extension of the SRT to T 1 = 82 K and T 2 = 120 K in near surface regions has been reported in Ref. [21] for bulk samples. A further increase of the SRT region may stem from the small size of the TFO grains and the resulting enlarged surface area.…”

“…Unlike in the SQUID measurements (FIG: 2 (b)), a remnant magnetization in R T is not observed above the SRT. A fundamentally different spin configuration at the surface layer compared to bulk is not expected since previous experiments on bulk samples underline the similarity of surface sensitive and bulk measurements [21,37,38]. The absence of a remnant signal may arise from the broken inversion symmetry at the TFO/Pt interface competing with the bulk DMI, reducing the canted moment at the interface.…”

The magnetic structure of DyFeO3 revisited: Fe spin reorientation and Dy incommensurate magnetic order

“…The magnetic order of the rare earth sublattice only appears at temperatures T N2 much lower than T SR [2] showing that the spin reorientation is not simply related to the onset of the rare earth moment. As the single ion anisotropy of the halffilled shell of the Fe 3+ ion is small, the magnetic interactions with the rare earth can, however, influence the spin direction even when being still very small [10]. Sivardiere et al [11][12][13] were the first to try to explain the existence of the spin reorientation transitions present only in RFeO 3 compounds hosting magnetic rare earths but absent for non-magnetic R = Lu, Eu, La, Y and as well absent for the isotropic R = Gd with L = 0.…”

Very weak bonds to artificial atoms formed by quantum corrals

“…The antiferromagnetically ordered Fe 3+ spins are slightly canted by the Dzyaloshinskii-Moriya interaction, resulting in a net ferromagnetic moment. As the magnetic anisotropy depends on temperature 26 , the spins undergo reorientation phase transitions at T 1 = 80 K and T 2 = 90 K. The anisotropy may also be modified by THz electric dipole transitions between crystal-field-split states of the electronic ground state of the Tm 3+ ions, the angular momenta of which are coupled with the Fe 3+ spins by exchange and dipolar interactions 29 . Our idea is to abruptly change the magnetic anisotropy by sufficiently strong THz pulses, causing the spins to switch fully ballistically.…”