Neutron Diffraction Studies of Antiferromagnetism in Manganous Fluoride and Some Isomorphous Compounds

Erickson, R. A.

doi:10.1103/physrev.90.779

Cited by 219 publications

(59 citation statements)

References 9 publications

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“…1 together with the relevant exchange parameters employed in this work. The antiferromagnetic ordering of the spins in CoF 2 was first determined by Erickson [4] using neutron diffraction and also confirmed through studies of the magnetic anisotropy of fluorides of the iron group elements [5]. Early theoretical studies of the static magnetic properties of CoF 2 in the paramagnetic and antiferromagnetic phases using an effective spin S = 3/2 Hamiltonian were performed by Nakamura and Taketa [6].…”

Section: Introductionmentioning

confidence: 99%

One-magnon and exciton inelastic light scattering in the antiferromagnet CoF2

Meloche

Cottam

Lockwood

2014

Low Temperature Physics

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Experimental data are reported for the temperature and polarization dependence of the one-magnon Raman light scattering in the rutile-structure antiferromagnet CoF 2 (Néel temperature T N = 38 K). The low-lying excitons are also investigated at low temperatures and comparisons made with results from earlier Raman, infrared, and neutron scattering work. A detailed analysis of the one-magnon Stokes and anti-Stokes Raman spectra is presented resulting in comprehensive data for the temperature variation up to T N of the one-magnon frequency, line width, and integrated intensity. A theory of the one-magnon scattering and other magnetic transitions is constructed based mainly on a spin S = 3/2 exchange model, extending a simpler effective S = 1/2 approach. The excitation energies and spectral intensities over a broad range of temperatures are obtained using a Green's function equation of motion method that allows for a careful treatment of the single-ion anisotropy. Overall the S = 3/2 theory compares well with the experimental data.

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Section: Introductionmentioning

confidence: 99%

One-magnon and exciton inelastic light scattering in the antiferromagnet CoF2

Meloche

Cottam

Lockwood

2014

Low Temperature Physics

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“…The collinearity between such opposite domains was found in epitaxial FeF 2 [27,39] and the absolute magnetization direction is known from the strong anisotropy [29] and Ising-like character of the AF [28,29]. It should also be noted that in contrast to other AF thin films [40], the AF domain structure of FeF 2 (110) cannot be imaged exploiting the X-ray Magnetic Linear Dichroism (XMLD) effect [41] at the Fe L 3,2 -edges.…”

Section: Domain Configurations Of the Continuous Bilayersmentioning

confidence: 99%

“…We choose FeF 2 as the AF because it has a simple crystal structure (body centered tetragonal) [26], a collinear spin structure with the Fe 2+ ions at the center of the unit cell ordering AF with respect to those at the corners [27][28], and a very strong uniaxial magnetic anisotropy (K∼1.39⋅10 8 erg/cm 3 ) along the [001] c axis [29]. Because of its large anisotropy, FeF 2 behaves as an Ising model system over a wide temperature range [30].…”

Section: Introductionmentioning

confidence: 99%

Manipulation of competing ferromagnetic and antiferromagnetic domains in exchange-biased nanostructures

et al. 2015

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Using photoemission electron microscopy combined with X-ray magnetic circular dichroism we show that a progressive spatial confinement of a ferromagnet (FM), either through thickness variation or laterally via patterning, actively controls the domains of uncompensated spins in the antiferromagnet (AF) in exchange biased systems. Direct observations of the spin structure in both sides of the FM/AF interface in a model system, Ni/FeF 2 , show that the spin structure is determined by the balance between the competing FM and AF magnetic energies.Coexistence of exchange bias domains, with opposite directions, can be established in Ni/FeF 2 bilayers for Ni thicknesses below 10 nm. Patterning the Ni/FeF 2 heterostructures with antidots destabilizes the FM state, enhancing the formation of opposite exchange bias domains below a critical antidot separation of the order of a few FeF 2 crystal domains. The results suggest that dimensional confinement of the FM may be used to manipulate the AF spin structure in spintronic devices and ultra-high density information storage media. The underlying mechanism of the uncompensated AF domain formation in Ni/FeF 2 may be generic to other magnetic systems with complex non-collinear FM/AF spin structures.

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“…The FeF2 has a rutile-type crystal structure and Nèel temperature TN=79K [14][15][16][17]. KNiF3 has a very small uniaxial anisotropy in comparison to FeF2 [12][13][14][15][16][17].…”

Section: T I S U S E F U L a T T H I S P O I N T T O S U M M A R I mentioning

confidence: 99%