Antiferromagnetic resonance in EuTe

Streit, P.; Everett, Glen E.

doi:10.1103/physrevb.21.169

Cited by 12 publications

(10 citation statements)

References 14 publications

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“…Finally it will be shown that also the concentration dependence of the critical exponent a of the specific heat may be related to the concentration dependence of the biquadratic exchange. (1).X (3) should hold approximately, at least near x = 1. Although an exact calculation taking into account the percolation threshold Xp = 0.13 for nearest and next-nearest neighbor interactions will result in a somewhat modified slope, the observed slope of the normalized Ntel line of 1.36 is appreciably larger than 1.…”

Section: The Observed Ntel Line Tn(x )mentioning

confidence: 99%

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Biquadratic exchange and critical behaviour in the diluted antiferromagnet EuxSr1−xTe

Köbler

Apfelstedt

Fischer

et al. 1993

Z. Physik B - Condensed Matter

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Abstract. Magnetization, specific heat, magnetocaloric effect, and neutron diffraction measurements have been performed in order to better understand the magnetic interactions and phase transitions in the diluted antiferromagnetic system EuxSrl_xTe. Due to the low N6el temperature of TN=9.8 K and the associated small critical field of Be(T= 0)= 7.5 T, EuTe provides the opportunity to change the angle between the antiferromagnetic moments continuously between 180 ~ and 0 ~ by applying a magnetic field and allows thus to probe the type of the magnetic interaction. It is found that in addition to the common bilinear Heisenberg exchange mechanism there is evidence for a small biquadratic exchange term, which has important consequences on the critical behaviour of EuxSr~_xTe. In the case of EuTe the biquadratic exchange supports the antiferromagnetic order, such that virtually no anisotropy exists and this restricts the antiferromagnetic (AF) to spin-flop (SF) transition to B0 = 0. On dilution with strontium, the biquadratic interaction decreases strongly and changes its sign at x~0.83 thus favouring the perpendicular moment orientation. This acts like an anisotropy on the dominating antiferromagnetic bilinear interaction and shifts the AF-SF phase line to finite fields which reach values of 0.3 T for T~ 0. No bicritieal behaviour is observed, but instead, the SF phase is the state of lowest energy in a small temperature interval below TN. The critical exponent ~(x) of the specific heat decreases in a non-linear way with dilution starting from a large positive value for EuTe. e(x) is close to the Heisenberg value -0.12 near x~0.83 where the biquadratic interaction is zero. The same applies for the exponent fl of the sublattice magnetization.

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Section: The Observed Ntel Line Tn(x )mentioning

confidence: 99%

“…In the ordered state, the spin-only moments of the Eu 2 + ions with 7 g~ are parallel to each other within (111) planes but alternate in direction between adjacent planes [2]. A small anisotropy within the (111) planes favours the [112] direction as the magnetic easy direction [3].…”

Section: Introductionmentioning

confidence: 99%

Biquadratic exchange and critical behaviour in the diluted antiferromagnet EuxSr1−xTe

Köbler

Apfelstedt

Fischer

et al. 1993

Z. Physik B - Condensed Matter

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“…For B ⊥ measurements, the microwave magnetic field only possesses components perpendicular to B ⊥ , hence only exciting the acoustic mode. In order to analyze these results quantitatively, we solve a coupled Landau-Lifshtitz-Gilbert (LLG) equation with small angle approximation [14,[39][40][41] (see Supplemental Material [37] for more details) and find the resonance condition of the two modes as…”

mentioning

confidence: 99%

Tunable magnon-magnon coupling in synthetic antiferromagnets

et al. 2020

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“…[29,30] Before presenting the spin structure of EuTe in our SLs, we will review the spin structure of bulk EuTe as a function of temperature and magnetic field. In zero field, EuTe makes a phase transition from the paramagnetic phase to the type-II antiferromagnetic phase at 9.8 K. [14] The type-II antiferromagnetic order is represented by ferromagnetic spin alignment within the (111) planes, the moments of adjacent planes being antiparallel (see Fig.3-1 …”

Section: X-ray Diffractionmentioning

confidence: 99%

“…[14] Thus EuTe is considered as an ideal Heisenberg magnet described by the Hamiltonian Eu atoms is larger than that of J 1 which couples two nearest-neighbor Eu atoms.…”

Section: The Eute Hamiltonianmentioning

confidence: 99%

Magnetic Properties of Heisenberg Antiferromagnetic EuTe/PbTe Superlattices

Chen

Dresselhaus²,

Dresselhaus

et al. 1994

MRS Proc.

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High quality MBE-grown EuTe/PbTe superlattices (SLs) with EuTe thicknesses ranging from one atomic monolayer to seven atomic layers per SL period have recently been made available. High resolution x-ray diffraction measurements and cross-sectional TEM images on these SL samples confirm the SL structure.Bulk EuTe with its highly symmetric rocksalt structure, spherically symmetric Eu 2+ 8S7/ 2 ground state and zero magnetic anisotropy is considered to be an ideal Heisenberg antiferromagnet. The small lattice mismatch between EuTe and PbTe allows EuTe in our SLs to retain the same isotropic magnetic couplings as in bulk EuTe. In addition, our SL samples provide a good realization of a 2D Heisenberg antiferromagnet, since (1) the EuTe thicknesses in each SL period are on the order of several atomic monolayers; (2) the non-magnetic PbTe layers separating neighboring EuTe layers are sufficiently thick to prevent any inter-period magnetic coupling. Thus, the study of the magnetic properties of EuTe/PbTe SLs is of great interest, since they provide an experimental realization of an ideal 2D Heisenberg antiferromagnet with localized spins, isotropic exchange interactions and no inter-period coupling.Having SLs with different EuTe layer thicknesses ranging from one to seven monolayers makes it possible to study the behavior of the magnetization and susceptibility as a function of the layer thickness. High magnetic field M(H) studies show that EuTe/PbTe SLs cross from a canted antiferromagnetic phase to a spin-aligned paramagnetic phase in high fields at low temperatures just like bulk EuTe, although the phase boundary moves toward lower fields and temperatures in the H-T plane as the EuTe thickness is decreased. The temperature-dependent susceptibility measurements show strong anisotropy between the in-plane and out-of-plane susceptibilities, starting at temperatures slightly above T, and extending to near T=0 K. The isotropic exchange couplings and the absence of magnetic anisotropy in EuTe/PbTe SLs implied by our M(T, H) studies lead us to believe that the dipolar interaction is the main source of anisotropy. Finally, Monte Carlo simulations, using a Heisenberg model with dipolar interactions show that these interactions, can stabilize long-range antiferromagnetic order in EuTe/PbTe SLs.

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Antiferromagnetic resonance in EuTe

Cited by 12 publications

References 14 publications

Biquadratic exchange and critical behaviour in the diluted antiferromagnet EuxSr1−xTe

Biquadratic exchange and critical behaviour in the diluted antiferromagnet EuxSr1−xTe

Tunable magnon-magnon coupling in synthetic antiferromagnets

Magnetic Properties of Heisenberg Antiferromagnetic EuTe/PbTe Superlattices

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