Neutron inelastic scattering study of rare-earth orthoferrite HoFeO3

Ovsyanikov, A.K.; Zobkalo, I.A.; Schmidt, W.; Barilo, S. N.; Гурецкий, С. А.; Hutanu, Vladimir

doi:10.1016/j.jmmm.2020.166855

Cited by 14 publications

(20 citation statements)

References 37 publications

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“…The critical field required for this first-order transition increases with decreasing temperature [23]. It is apt to compare these phases with those in the parent orthoferrites, HoFeO 3 and DyFeO 3 [19,20,22]. In HoFeO 3 , phase transitions occur in the following order as the temperature decreases: [18].…”

Section: Magnetic Phases and Spin Re-orientation In Ho05dy 05 Feo3mentioning

confidence: 99%

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Probing magnetic anisotropy and spin-reorientation transition in 3D antiferromagnet, Ho$_{0.5}$Dy$_{0.5}$FeO$_{3}\vert$Pt using spin Hall magnetoresistance

Wagh¹,

Garg²,

Haldar³

et al. 2022

Preprint

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Orthoferrites (REFeO 3 ) containing rare-earth (RE) elements are 3D antiferromagnets (AFM) that exhibit characteristic weak ferromagnetism originating due to slight canting of the spin moments and display a rich variety of spin reorientation transitions in the magnetic field (H)-temperature (T ) parameter space. We present spin Hall magnetoresistance (SMR) studies on a b-plate (acplane) of crystalline Ho 0.5 Dy 0.5 FeO 3 |Pt hybrid at various T in the range, 11 to 300 K. In the room temperature Γ4(Gx, Ay, Fz) phase, the switching between two degenerate domains, Γ4(+Gx, +Fz) and Γ4(−Gx, −Fz) occurs at fields above a critical value, Hc ≈ 713 Oe. Under H > Hc, the angular dependence of SMR (α-scan) in the Γ4(Gx, Ay, Fz) phase yielded a highly skewed curve with a sharp change (sign-reversal) along with a rotational hysteresis around a-axis. This hysteresis decreases with an increase in H. Notably, at H < Hc, the α-scan measurements on the single domain, Γ4(±Gx, ±Fz) exhibited an anomalous sinusoidal signal of periodicity 360 deg. Low-T SMR curves (H = 2.4 kOe), showed a systematic narrowing of the hysteresis (down to 150 K) and a gradual reduction in the skewness (150 to 52 K), suggesting weakening of the anisotropy possibly due to the T -evolution of Fe-RE exchange coupling. Below 25 K, the SMR modulation showed an abrupt change around the c-axis, marking the presence of Γ2(Fx, Cy, Gz) phase. We have employed a simple Hamiltonian and computed SMR to examine the observed skewed SMR modulation. In summary, SMR is found to be an effective tool to probe magnetic anisotropy as well as a spin reorientation in Ho 0.5 Dy 0.5 FeO 3 . Our spin-transport study highlights the potential of Ho 0.5 Dy 0.5 FeO 3 for future AFM spintronic devices.

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Section: Magnetic Phases and Spin Re-orientation In Ho05dy 05 Feo3mentioning

confidence: 99%

“…[19][20][21]. Alternatively, some neutron studies on single crystal HoFeO 3 claimed that there are two SRTs; Γ 4 55K − −− → Γ 1 36K − −− → Γ 2 [22]. Chakraborty et al [23] reported the presence of two-fold SRT, in their magnetic studies on single crystals of Ho 0.5 Dy 0.5 FeO 3 i.e.…”

Section: Introductionmentioning

confidence: 99%

Probing magnetic anisotropy and spin-reorientation transition in 3D antiferromagnet, Ho$_{0.5}$Dy$_{0.5}$FeO$_{3}\vert$Pt using spin Hall magnetoresistance

Wagh¹,

Garg²,

Haldar³

et al. 2022

Preprint

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show abstract

“…Moreover, in order to obtain a proper description of spin waves one has to take into account exchange interactions within the second coordination sphere. Due to the structural distortion, the exchange interactions within each coordination sphere are slightly (∼10%) anisotropic with J c > J ab [60][61][62].…”

Section: Short Review Of Spin Dynamics In the Transition-metal Subsystemmentioning

confidence: 99%

Low-energy spin dynamics in rare-earth perovskite oxides

Podlesnyak

Nikitin

Ehlers

2021

J. Phys.: Condens. Matter

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We review recent studies of spin dynamics in rare-earth orthorhombic perovskite oxides of the type RMO 3 , where R is a rare-earth ion and M is a transition-metal ion, using single-crystal inelastic neutron scattering (INS). After a short introduction to the magnetic INS technique in general, the results of INS experiments on both transition-metal and rare-earth subsystems for four selected compounds (YbFeO 3 , TmFeO 3 , YFeO 3 , YbAlO 3 ) are presented. We show that the spectrum of magnetic excitations consists of two types of collective modes that are well separated in energy: gapped magnons with a typical bandwidth of <70 meV, associated with the antiferromagnetically (AFM) ordered transition-metal subsystem, and AFM fluctuations of <5 meV within the rare-earth subsystem, with no hybridization of those modes. We discuss the high-energy conventional magnon excitations of the 3d subsystem only briefly, and focus in more detail on the spectacular dynamics of the rare-earth sublattice in these materials. We observe that the nature of the ground state and the low-energy excitation strongly depends on the identity of the rare-earth ion. In the case of non-Kramers ions, the low-symmetry crystal field completely eliminates the degeneracy of the multiplet state, creating a rich magnetic field-temperature phase diagram. In the case of Kramers ions, the resulting ground state is at least a doublet, which can be viewed as an effective quantum spin-1/2. Equally important is the fact that in Yb-based materials the nearest-neighbor exchange interaction dominates in one direction, despite the three-dimensional nature of the orthoperovskite crystal structure. The observation of a fractional spinon continuum and quantum criticality in YbAlO 3 demonstrates that Kramers rare-earth based magnets can provide realizations of various aspects of quantum low-dimensional physics.

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“…Comprehensive investigations of the spin dynamics in the transition-metal subsystem were mainly focused on the Fe 3+ sublattice in orthoferrites [14,20,22,[59][60][61][62].…”

Section: Short Review Of Spin Dynamics In the Transition-metal Subsystemmentioning

confidence: 99%

“…Due to the structural distortion, the exchange interactions within each coordination sphere are slightly (∼ 10 %) anisotropic with J c > J ab [60][61][62].…”

Section: ]mentioning

confidence: 99%

Low-energy spin dynamics in rare-earth perovskite oxides

Podlesnyak,

Nikitin,

Ehlers

2021

Preprint

View full text Add to dashboard Cite

We review recent studies of spin dynamics in rare-earth orthorhombic perovskite oxides of the type RM O 3 , where R is a rare-earth ion and M is a transition-metal ion, using single-crystal inelastic neutron scattering (INS). After a short introduction to the magnetic INS technique in general, the results of INS experiments on both transition-metal and rare-earth subsystems for four selected compounds (YbFeO 3 , TmFeO 3 , YFeO 3 , YbAlO 3 ) are presented. We show that the spectrum of magnetic excitations consists of two types of collective modes that are well separated in energy: gapped magnons with a typical bandwidth of <70 meV, associated with the antiferromagnetically (AFM) ordered transition-metal subsystem, and AFM fluctuations of <5 meV within the rareearth subsystem, with no hybridization of those modes. We discuss the highenergy conventional magnon excitations of the 3d subsystem only briefly, and focus in more detail on the spectacular dynamics of the rare-earth sublattice in these materials. We observe that the nature of the ground state and the lowenergy excitation strongly depends on the identity of the rare-earth ion. In the case of non-Kramers ions, the low-symmetry crystal field completely eliminates the degeneracy of the multiplet state, creating a rich magnetic field-temperature phase diagram. In the case of Kramers ions, the resulting ground state is at least a doublet, which can be viewed as an effective quantum spin-1/2. Equally important is the fact that in Yb-based materials the nearest-neighbor exchange interaction dominates in one direction, despite the three-dimensional nature of the orthoperovskite crystal structure. The observation of a fractional spinon continuum and quantum criticality in YbAlO 3 demonstrates that Kramers rareearth based magnets can provide realizations of various aspects of quantum lowdimensional physics.

show abstract

Neutron inelastic scattering study of rare-earth orthoferrite HoFeO3

Cited by 14 publications

References 37 publications

Probing magnetic anisotropy and spin-reorientation transition in 3D antiferromagnet, Ho$_{0.5}$Dy$_{0.5}$FeO$_{3}\vert$Pt using spin Hall magnetoresistance

Probing magnetic anisotropy and spin-reorientation transition in 3D antiferromagnet, Ho$_{0.5}$Dy$_{0.5}$FeO$_{3}\vert$Pt using spin Hall magnetoresistance

Low-energy spin dynamics in rare-earth perovskite oxides

Low-energy spin dynamics in rare-earth perovskite oxides

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