Magnetic order of Dy3+ and Fe3+ moments in antiferromagnetic Dy

Abstract

We report on spin Hall magnetoresistance (SMR) and spin Seebeck effect (SSE) in a single crystal of the rare-earth antiferromagnet DyFeO 3 with a thin Pt film contact. The angular shape and symmetry of the SMR at elevated temperatures reflect the antiferromagnetic order of the Fe 3+ moments as governed by the Zeeman energy, the magnetocrystalline anisotropy, and the Dzyaloshinskii-Moriya interaction. We interpret the observed linear dependence of the signal on the magnetic field strength as evidence for field-induced order of the Dy 3+ moments up to room temperature. At and below the Morin temperature of 50 K, the SMR monitors the spinreorientation phase transition of Fe 3+ spins. Below 23 K, additional features emerge that persist below 4 K, the ordering temperature of the Dy 3+ magnetic sublattice. We conclude that the combination of SMR and SSE is a simple and efficient tool to study spin reorientation phase transitions and sublattice magnetizations.

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

“…More important than the knowledge about the presence or absence of an F-type coupling is the information that it would be allowed within the same IR. This is different from the magnetic order as supposed in the recent literature [7,8,18,20,21,24,25] for the Dy-sublattice with k = 0 and the Γ 5 (G x A y ) model which has no third allowed BV. Figure 5 displays the refinement of the T = 1.6 K data ignoring BV3 but including a small contribution from the third harmonics of the k = [0, 0, l] phase (see figure 4 for the (001) +3k reflection).…”

“…The possibility to recover the Γ 4 groundstate in DyFeO 3 applying an external magnetic field even below T SR has been first shown by Belov et al [16] and further discussed by Eremenko et al [17] and later again by Tokunaga et al [18]. While the value of T SR has been given as lying between 30 K and 52 K [1,8,[18][19][20] from magnetization, spin Hall magnetoresistance and neutron diffraction studies using single crystals, Rajeswaran et al [21] found the onset of T SR at 80 K from Mössbauer and magnetization studies on a powder.…”

“…In this context, the recent literature on DyFeO 3 [7,8,18,20,21,24,25] assumed without exception that the Dy-sublattice orders as in DyAlO 3 [31] and DyCoO 3 [32] in a commensurate G x A y configuration corresponding to Γ 5 for the rare earth 4c site. Zhao et al [7] postulated an unknown magnetic structure of the Fe-sublattice below T N2 to explain a step like increase of the polarization P(H ) and irreversible effects in magnetization, polarization and specific heat when cooled in zero magnetic and electric field but did not question the commensurate G x A y type order of the Dy-sublattice.…”

Observation of magnetization surface textures of the van der Waals antiferromagnet FePS3 by spin Hall magnetoresistance

“…SMR has been observed in paramagnetic CoCr 2 O 4 [10], amorphous yttrium iron garnet (YIG) [11], Cr 2 O 3 [12], NdGaO 3 [13], and gadolinium gallium garnet (GGG) [14]. The SMR revealed magnetic phase transitions in α-Fe 2 O 3 [15], CoCr 2 O 4 [10], and DyFeO 3 [16] and magnetic domain structures [17]. The SMR in the longitudinal resistance of a metal contact on an antiferromagnet with two sublattices A and B reads…”

Spin and magnon transport in antiferromagnetic van der Waals materials and yttrium iron garnet

“…The SMR revealed magnetic phase transitions in α-Fe 2 O 3 [75], and DyFeO 3 2.4. MAGNETORESISTANCE 2 23 [76] and magnetic domain structures [77].…”