Magnetic Properties of ZnFe<sub>2</sub>O<sub>4</sub>as a 3-D Geometrical Spin Frustration System

Usa, Toshihiro; Kamazawa, Kazuya; Sekiya, Hirofumi; Nakamura, Shigenari; Tsunoda, Yorihiko; Kohn, K.; Tanaka, Midori

doi:10.1143/jpsj.73.2834

Cited by 34 publications

(42 citation statements)

References 13 publications

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“…Bulk zinc ferrites exhibit normal spinel structure with all zinc ions on A-site and all ferric ions at B-site and is paramagnetic at room temperature having Neel temperature of 10 K. 5 It is believed that zinc ferrite with ideal normal spinel structure is a three-dimensional spin frustrated magnet. 6 The magnetic properties are significantly affected when the intermediate configuration is attained. It is described by the inversion parameter which accounts for the amount of Fe on tetrahedral site.…”

Section: Introductionmentioning

confidence: 99%

Relaxation Phenomena in Nanostructured Zinc Ferrite

et al. 2009

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The electron paramagnetic resonance (EPR) is a well known tool to investigate the magnetic relaxation phenomena in the magnetic particles. For the present investigation, temperature variant EPR has been performed in order to study the relaxation mechanism in zinc ferrite nanoparticles. The magnetic nanoparticles were synthesized by using the nitrates of zinc and iron, and citric acid. The particle size of the samples were measured by the X-ray diffraction and Transmission Electron Microscopy. A more precise, Williamson-Hall (W-H) approach was used for the determination of the particle size as well as the strain in nanoparticles. The kinematics of magnetic moment has been studied with the help of temperature dependent EPR spectroscopy. Relaxation time calculations and temperature dependence of linewidth show the dominance of spin-lattice relaxation in these systems. Both nanoparticle systems show the presence of direct and Raman process in the relaxation mechanism and completely rule out the presence of Orbach process.

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Section: Introductionmentioning

confidence: 99%

Relaxation Phenomena in Nanostructured Zinc Ferrite

et al. 2009

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“…The stable phase of zinc ferrite ͑ZnFe 2 O 4 ͒ possesses a normal spinel structure-i.e., ͓Zn 2+ ͔ A ͓Fe 2 3+ ͔ B O 4 , where the subscripts A and B denote the tetrahedral and octahedral sites in a face-centered-cubic close-packed oxygen sublattice, respectively. It is well known that the normal spinel ZnFe 2 O 4 behaves like an antiferromagnet with a Néel temperature of 10 K ͑strictly speaking, ZnFe 2 O 4 with ideal normal spinel structure is a three-dimensional spin frustrated magnet, so that the long-range magnetic order is not accomplished down to 1.5 K at least 1,2 ͒. The magnetic transition at very low temperature results from the weak superexchange interaction between Fe 3+ ions in the B sites.…”

Section: Introductionmentioning

confidence: 99%

First-principles XANES simulations of spinel zinc ferrite with a disordered cation distribution

et al. 2007

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Theoretical calculations of Zn K and Fe K x-ray absorption near-edge structures ͑XANES͒ using a firstprinciples method have been performed to evaluate the degree of cation disordering in spinel zinc ferrite ͑ZnFe 2 O 4 ͒ thin film prepared by a sputtering method, ZnFe 2 O 4 thin films annealed at elevated temperatures, and ZnFe 2 O 4 bulk specimen prepared by a solid-state reaction. Using the full-potential linearized augmented plane-wave ϩ local orbitals method, a theoretical spectrum is generated for the tetrahedral and octahedral environments for each of the two cations. The experimental XANES spectrum of the thin film annealed at 800°C as well as that of bulk specimen is successfully reproduced by using either the theoretical spectrum for Zn 2+ on the tetrahedral site ͑A site͒ or that for Fe 3+ on the octahedral site ͑B site͒, which is indicative of the normal spinel structure. For the as-deposited film, on the other hand, excellent agreement between theoretical and experimental spectra is obtained by considering the presence of either ion in both the A and B sites. The degree of cation disordering, x, defined as ͓Zn 1−x 2+ Fe x 3+ ͔ A ͓Zn x 2+ Fe 2−x 3+ ͔ B O 4 , is estimated to be approximately 0.6 in the as-deposited film, which is consistent with the analysis of the extended x-ray absorption fine structure on the Zn K edge. Curious magnetic properties as we previously observed for the as-deposited thin film-i.e., ferrimagnetic behaviors accompanied by large magnetization at room temperature and cluster spinglass-like behavior-are discussed in connection with disordering of Zn 2+ and Fe 3+ ions in the spinel-type structure.

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“…The underlying magnetism of the spinel ferrite ZnFe 2 O 4 has been of interest over the last three decades in the condensed matter community [1], [2], [3], [4], [5]. ZnFe 2 O 4 in its normal structure (i.e., with Fe 3+ and Zn 2+ ions at octahedral B and tetrahedral A -sites, respectively) is widely identified as an antiferromagnet insulator with a Néel temperature (TN) around 10 K and a band gap of 0.2 eV [1], [6].…”

Section: Introductionmentioning

confidence: 99%

“…ZnFe 2 O 4 in its normal structure (i.e., with Fe 3+ and Zn 2+ ions at octahedral B and tetrahedral A -sites, respectively) is widely identified as an antiferromagnet insulator with a Néel temperature (TN) around 10 K and a band gap of 0.2 eV [1], [6]. However, its low temperature magnetic state has been the subject of discussion leading to different proposals [1], [3], [4], [7]. The B -sites in spinel compounds form a network of corner-sharing tetrahedra known as the pyrochlore lattice.…”

Section: Introductionmentioning

confidence: 99%

“…The macroscopic degeneracy of the ground state of geometrically frustrated compounds can give rise to glassy magnetic behaviors and even lead to the inhibition of a long-range order (LRO) [8], [9], [10], [11], [12]. In fact, the LRO detected in nominally normal ZnFe 2 O 4 [4] has been attributed to the presence of extrinsic defects [3]. Indeed, neutron scattering results on high-purity ZnFe 2 O 4 single-crystal indicated that the compound remains magnetically disordered (at least partially) even at temperatures as low as 1.5 K [1].…”

Section: Introductionmentioning

confidence: 99%

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On the deviation from a Curie–Weiss behavior of the ZnFe2O4 susceptibility: A combined ab-initio and Monte-Carlo approach

Quintero

Rodríguez

Albarracín

et al. 2019

Heliyon

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We present a numerical study of the magnetic properties of ZnFe2O4 using Monte-Carlo simulations performed considering a Heisenberg model with antiferromagnetic couplings determined by Density Functional Theory. Our calculations predict that the magnetic susceptibility has a cusp-like peak centered at 13 K, and follows a Curie–Weiss behavior above this temperature with a high and negative Curie–Weiss temperature (normalΘCW=−170 K). These results agree with the experimental data once extrinsic contributions that give rise to the deviation from a Curie–Weiss law are discounted. Additionally, we discuss the spin configuration of ZnFe2O4 below its ordering temperature, where the system presents a high degeneracy.

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Magnetic Properties of ZnFe₂O₄as a 3-D Geometrical Spin Frustration System

Cited by 34 publications

References 13 publications

Relaxation Phenomena in Nanostructured Zinc Ferrite

Relaxation Phenomena in Nanostructured Zinc Ferrite

First-principles XANES simulations of spinel zinc ferrite with a disordered cation distribution

On the deviation from a Curie–Weiss behavior of the ZnFe2O4 susceptibility: A combined ab-initio and Monte-Carlo approach

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Magnetic Properties of ZnFe2O4as a 3-D Geometrical Spin Frustration System

Cited by 34 publications

References 13 publications

Relaxation Phenomena in Nanostructured Zinc Ferrite

Relaxation Phenomena in Nanostructured Zinc Ferrite

First-principles XANES simulations of spinel zinc ferrite with a disordered cation distribution

On the deviation from a Curie–Weiss behavior of the ZnFe2O4 susceptibility: A combined ab-initio and Monte-Carlo approach

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Magnetic Properties of ZnFe₂O₄as a 3-D Geometrical Spin Frustration System