Magnetic Anisotropy in Antiferromagnetic Corundum-Type Sesquioxides

Artman, J. O.; Murphy, J. C.; Foner, S.

doi:10.1103/physrev.138.a912

Cited by 227 publications

(140 citation statements)

References 21 publications

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“…[262][263][264][265][266][267][268]. Theoretical work showed that the Morin transition depends on a via adependent dipolar anisotropy term [260], and the size effect of T M 0 (D) has been induced by the change of the dipolar magnetic field with a lattice expansion [263,269,270]. This is in partial agreement with observed pressure dependencies of T M 0 [271,272].…”

Section: The Morin Transitionsupporting

confidence: 77%

“…Whilst below T M 0 the spins are aligned AFM along [111] axis. The Morin transition arises from a competition between the local ionic anisotropy term from spin-orbit coupling and the long-range dipolar anisotropy term [260,261]. The former tends to make spins direct themselves along ±z-axis, while the latter does spins lying in xy-plane [261].…”

Section: The Morin Transitionmentioning

confidence: 99%

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Size Dependence of Structures and Properties of Magnetic Materials

Jiang¹,

Lang²

2007

TONANOJ

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Due to the involvement of high portion of atomic coordination imperfection in surfaces and interfaces, the properties of magnetic nanocrystals dramatically differ from that of the corresponding bulk counterparts, which have led to a surge in both experimental and theoretical investigations in the past decades. This review summarizes the studies for these size-dependent magnetic properties, and additional thermal or phase stabilities, and mechanical properties. To interpret the above phenomena, a thermodynamic model for the size dependence and interface dependences of these properties is described, which is based on Lindemann s criterion for melting, Mott s expression for the vibrational melting entropy, and Shi s model for the size-dependent melting temperature. The model without any adjustable parameter is confirmed by a large number of experimental results, and helps us to understand the structures and properties of the magnetic nanocrystals. Moreover, other theoretical works on the above properties are also mentioned and commented.

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Section: The Morin Transitionsupporting

confidence: 77%

Section: The Morin Transitionmentioning

confidence: 99%

Size Dependence of Structures and Properties of Magnetic Materials

Jiang¹,

Lang²

2007

TONANOJ

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“…Spin flip arises by effect of the interplay of two competing magnetic anisotropy terms, one of single-ion nature and favouring the alignment of moments along the c-axis, the other of dipolar nature and favouring the alignment on the basal plane [40]. Below TM the first term prevails; above TM the second one becomes predominant.…”

Section: Magnetic Analysismentioning

confidence: 99%

Eu-doped α-Fe2O3 nanoparticles with modified magnetic properties

Freyria

Barrera

Tiberto

et al. 2013

Journal of Solid State Chemistry

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“…Below 265 K, termed the Morin transition (T M ), spins re-order to lie parallel to the c-axis in an antiferromagnetic arrangement, due to the competition between magnetic-dipole and single-ion anisotropy energies. 41 We will refer to these regimes as the weak ferromagnetic state (WFS) and the antiferromagnetic state (AFS) respectively. Above 955 K (the Néel temperature), hematite is paramagnetic.…”

Section: View Article Onlinementioning

confidence: 99%

Synthesis, electronic transport and optical properties of Si:α-Fe₂O₃ single crystals

et al. 2016

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We report the synthesis of silicon-doped hematite (Si:a-Fe 2 O 3 ) single crystals via chemical vapor transport, with Si incorporation on the order of 10 19 cm À3. The conductivity, Seebeck and Hall effect were measured in the basal plane between 200 and 400 K. Distinct differences in electron transport were observed above and below the magnetic transition temperature of hematite at B265 K (the Morin transition, T M ). Above 265 K, transport was found to agree with the adiabatic small-polaron model, the conductivity was characterized by an activation energy of B100 meV and the Hall effect was dominated by the weak ferromagnetism of the material. A room temperature electron drift mobility of B10 À2 cm 2 V À1 s À1was estimated. Below T M , the activation energy increased to B160 meV and a conventional Hall coefficient could be determined. In this regime, the Hall coefficient was negative and the corresponding Hall mobility was temperature-independent with a value of B10 À1 cm 2 V À1 s À1. Seebeck coefficient measurements indicated that the silicon donors were fully ionized in the temperature range studied. Finally, we observed a broad infrared absorption upon doping and tentatively assign the feature at B0.8 eV to photon-assisted small-polaron hops. These results are discussed in the context of existing hematite transport studies.

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Magnetic Anisotropy in Antiferromagnetic Corundum-Type Sesquioxides

Cited by 227 publications

References 21 publications

Size Dependence of Structures and Properties of Magnetic Materials

Size Dependence of Structures and Properties of Magnetic Materials

Eu-doped α-Fe2O3 nanoparticles with modified magnetic properties

Synthesis, electronic transport and optical properties of Si:α-Fe₂O₃ single crystals

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Magnetic Anisotropy in Antiferromagnetic Corundum-Type Sesquioxides

Cited by 227 publications

References 21 publications

Size Dependence of Structures and Properties of Magnetic Materials

Size Dependence of Structures and Properties of Magnetic Materials

Eu-doped α-Fe2O3 nanoparticles with modified magnetic properties

Synthesis, electronic transport and optical properties of Si:α-Fe2O3 single crystals

Contact Info

Product

Resources

About

Synthesis, electronic transport and optical properties of Si:α-Fe₂O₃ single crystals