Observation of Ferri- and Antiferromagnetic Resonance in Insulating Magnetic Spiral Structures

Stickler, J J; Zeiger, H. J.

doi:10.1063/1.1656153

Cited by 14 publications

(6 citation statements)

References 6 publications

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“…The g factor is 1.996, in agreement well with the previous works. 6,25,26 The linear decrease of ∆H PP with temperature can be attributed to a single-phonon spin-lattice relaxation mechanism.…”

Section: Resultsmentioning

confidence: 99%

Study of negative thermal expansion in the frustrated spinel ZnCr2Se4

Chen

Yang

Tong

et al. 2014

Journal of Applied Physics

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The origin of negative thermal expansion (NTE) in the bond frustrated ZnCr 2 Se 4 has been explored. ESR and FTIR document an ideal paramagnetic state above 100 K, below which ferromagnetic clusters coexist with the paramagnetic state down to T N . By fitting the inverse susceptibility above 100 K using a modified paramagnetic Curie-Weiss law, an exponentially changeable exchange integral J is deduced. In the case of the variable J, magnetic exchange and lattice elastic energy couple with each other effectively via magnetoelastic interaction in the ferromagnetic clusters, where NTE occurs at a loss of exchange energy while a gain of lattice elastic one.

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Section: Resultsmentioning

confidence: 99%

Study of negative thermal expansion in the frustrated spinel ZnCr2Se4

Chen

Yang

Tong

et al. 2014

Journal of Applied Physics

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“…The nonzero value obtained for f u [15,16] (ν~ 10 GHz) originates from the anisotropy of the forces acting on the spin subsystem. Incidentally, the behavior of the f ex mode was only calculated [16] but not observed exper imentally.…”

Section: Magnetic and Dielectric Response Of Cobalt Chromium Spinel Cmentioning

confidence: 92%

“…More than 40 years ago, CoCr 2 O 4 was studied by electron spin resonance (ESR) [15,16]. By extrapo lating to B = 0, one derived from a series of resonance frequencies observed in different magnetic fields the temperature dependences of the two "internal critical frequencies," f u and f ex .…”

Section: Magnetic and Dielectric Response Of Cobalt Chromium Spinel Cmentioning

confidence: 99%

“…Incidentally, the behavior of the f ex mode was only calculated [16] but not observed exper imentally. For a theoretical analysis of these modes which was performed under the assumption of the spin structure being ferrimagnetic spiral the Reader can be referred to [15][16][17]. This analysis included A-A , B-B and anisotropic interactions.…”

Section: Magnetic and Dielectric Response Of Cobalt Chromium Spinel Cmentioning

confidence: 99%

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Magnetic and dielectric response of cobalt-chromium spinel CoCr2O4 in the terahertz frequency range

et al. 2012

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The nature of the phonon and magnon modes in the CoCr 2 O 4 multiferroic with a cubic spinel structure has been studied using submillimeter spectroscopy and infrared Fourier spectroscopy. This paper reports on the first measurement of the evolution with temperature of the exchange optical magnon in the ferrimagnetic (T C = 94 K) and two low symmetry (T S ≈ 26 K, T lock in = 14.5 K) phases of CoCr 2 O 4 down to T = 5 K in zero magnetic field. It has been shown that the detected magnon is not a ferrimagnetic order parameter and originates, most probably, from spin precession in the cobalt sublattices. At the points of the magnetic phase transitions, the oscillator parameters of the two lowest frequency phonon modes reveal an anomalous temperature behavior, thus evidencing the presence of significant interaction between the mag netic and phonon subsystems. The increase by 25% of the damping parameter of the phonon mode originat ing from vibrations of the CoO 4 tetrahedra during the transition of CoCr 2 O 4 to the multiferroic state (T < T S ) suggests structural changes in the lattice involving loss of spatial central symmetry of the medium.

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“…The first of them is associated with the conventional spin precession. In CoCr 2 O 4 , such a mode has been observed by electron-spin-resonance studies at frequencies below 100 GHz in fields up to 10 T. 22,23 The second mode, the inter-sublattice exchange resonance, is supposed to have a large zero-field gap defined by the exchange interaction between the sublattices, to harden in an applied magnetic field, and to have a steep field dependence. 24 Our observed mode demonstrates this very behavior (Fig.…”

mentioning

confidence: 99%

Observation of an intersublattice exchange magnon in CoCr2O4and analysis of magnetic ordering

et al. 2013

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We report on an investigation of optical properties of multiferroic CoCr2O4 at terahertz frequencies in magnetic fields up to 30 T. Below the ferrimagnetic transition (94 K), the terahertz response of CoCr2O4 is dominated by a magnon mode, which shows a steep magnetic-field dependence. We ascribe this mode to an exchange resonance between two magnetic sublattices with different gfactors. In the framework of a simple two-sublattice model (the sublattices are formed by Co 2+ and Cr 3+ ions), we find the inter-sublattice coupling constant, λ = −(18 ± 1) K, and trace the magnetization for each sublattice as a function of field. We show that the Curie temperature of the Cr 3+ sublattice, Θ2 = (49 ± 2) K, coincides with the temperature range, where anomalies of the dielectric and magnetic properties of CoCr2O4 have been reported in literature.

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Observation of Ferri- and Antiferromagnetic Resonance in Insulating Magnetic Spiral Structures

Cited by 14 publications

References 6 publications

Study of negative thermal expansion in the frustrated spinel ZnCr2Se4

Study of negative thermal expansion in the frustrated spinel ZnCr2Se4

Magnetic and dielectric response of cobalt-chromium spinel CoCr2O4 in the terahertz frequency range

Observation of an intersublattice exchange magnon in CoCr2O4and analysis of magnetic ordering

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