Hall effect in magnetite

Kostopoulos, D.; Theodossiou, A.

doi:10.1002/pssa.19700020108

Cited by 16 publications

(7 citation statements)

References 16 publications

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“…The activation energies are about 26 meV in the cubic phase and 95 meV in the orthorhombic phase. There is no evidence of polarity reversal as reported by Kostopoulos and Theodossiou (1970). The scatter in the data points is due to temperature variations of about L-01 K : 0 , 15 PA; 0 , 5 PA.…”

Section: Extraordinary Hull Effectmentioning

confidence: 47%

“…Siemons (1970) reported a positive Hall coefficient, implying hole conductivity. On the other hand, Lavine (1959) and Kostopoulos and Theodossiou (1970) both reported negative Hall coefficients for other ferrites. Further evidence of electron con- duction is given by the negative Seebeck coefficients reported by Lavine (1959) and Constantin and Rosenberg (1972).…”

Section: Introductionmentioning

confidence: 95%

“…Most materials have a positive transverse magnetoresistance and a much smaller longitudinal magnetoresistance (Putley 1968). Magnetite has been reported to have both positive and negative transverse magnetoresistance, depending on the magnitude of the applied field, the crystallographic orientation, the temperature, and the origin of the sample (Domenicali 1950, Zalesskii 1961, Kostopoulos 1970. The reported longitudinal magnetoresistance is of comparable magnitude (Domenicali 1950).…”

Section: Magnetoresistancementioning

confidence: 99%

“…Previous measurements of the electrical properties have been performed on crystalline or ceramic samples (Bickford 1953, Lavine 1959, Kostopoulos and Theodossiou 1970, Kostopoulos 1972, Siemons 1970, Drabble et a1 1971, Calhoun 1954and DomeniCali 1950. The conductivity has been measured from below 4 K to above the Curie temperature of 858 K. The extraordinary Hall effect has been measured on bulk samples from 77K to over 200°C (Lavine 1961, Kostopoulos andTheodossiou 1970).…”

Section: Introductionmentioning

confidence: 99%

“…The conductivity has been measured from below 4 K to above the Curie temperature of 858 K. The extraordinary Hall effect has been measured on bulk samples from 77K to over 200°C (Lavine 1961, Kostopoulos andTheodossiou 1970). The ordinary Hall coefficient has been reported by three experimenters with conflicting results.…”

Section: Introductionmentioning

confidence: 99%

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Magnetoelectric properties of magnetite thin films

Feng¹,

Pashley²,

Nicolet³

1975

J. Phys. C: Solid State Phys.

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Abstract. Resistivity, DC Hall effect and transverse magnetoresistance measurements were made on polycrystalline thin films of magnetite (Fe,OJ from 104 K to room temperature. The Verwey transition is observed at Tv = 123 K, about 4 K higher than reported for bulk magnetite. The ordinary and extraordinary Hall coefficients are negative over the entire temperature range, consistent with negatively charged carriers. The extraordinary Hall coefficient exhibits a dependence on the resistivity above Tv and a p2', dependence below Tv. The magnetoresistance is negative at all temperatures and for all magnetic field strengths. The planar Hall effect signal was below the sensitivity of the present experiment.

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Section: Extraordinary Hull Effectmentioning

confidence: 47%

Section: Introductionmentioning

confidence: 95%

Section: Magnetoresistancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Magnetoelectric properties of magnetite thin films

Feng¹,

Pashley²,

Nicolet³

1975

J. Phys. C: Solid State Phys.

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Magnetoresistance of magnetite

Kostopoulos

1972

Phys. Stat. Sol. (a)

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The transversal magnetoresistance was studied in single crystals of natural magnetite for different temperatures between 300 and 77 °K and in fields up to 10 kG. For temperatures above the transition point, i.e. in the cubic phase, the magnetoresistance is positive and shows a maximum at 5 kG. This effect becomes stronger the nearer temperature approaches the transition point. Below the tranisition point, i.e. in the orthorhombic phase, the magnetoresistance is negative increasing with magnetic field and with temperature up to the transition point. The effect of temperature change increases with increasing fields.

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The low temperature transition of magnetite in a magnetic field and its influence on the magnetoresistance

Kostopoulos

1973

Phys. Stat. Sol. (a)

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An interesting characteristic of magnetite is the phase transition from an f.c.c. arrangement to orthorhombic occurring near 115 K. In the orthorhombic phase the c-axis coincides with one of the cubic [loo] axes while the a-and b-axes lie along (110) directions (1). 0When a steady magnetic field H is applied to a crystal of magnetite as it is cooled through the transition temperature, the cube edge that lies nearest to the magnetic field is selected a s the c-axis of the orthorhombic structure, This direction, however, can be influenced below the transition temperature, by applying a field in direction of another cube edge (2). trThe magnetoresistance (MR) of magnetite was investigated many years ago and was found to be either positive or negative (3). Its dependence on the magnetic field was further investigated in a number of papers (4 to 8).In the present paper the MR of synthetic and natural magnetite was measured in a working field H directions of H and H magnetite') had a cylindrical shape with the axis along the [110] direction. This was also the direction of the electric current. Ohmic contacts were obtained by soldering indium to the samples after wetting them with In-Hg amalgam. Two samples of natural magnetite were used of parallelepiped shape with dimensions 1 x 4~1 2 mm , and with the large face a s the (111) plane. The electric current was along the [liO] direction. The magnetic field was always along the [lll] direction. up to 1 1 kG, after cooling under various H W tr up to 10 kG. The were always parallel to each other. The sample of synthetic W tr 3 Before each measurement the sample was demagnetized. After each measurement of MR versus Hw the samples were annealed up to room temperature, then 1) The sample was kindly offered by Prof. B. Luthi of Rutgers University, and was grown at the I. B. M. Research Laboratory.

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Hall effect in magnetite

Cited by 16 publications

References 16 publications

Magnetoelectric properties of magnetite thin films

Magnetoelectric properties of magnetite thin films

Magnetoresistance of magnetite

The low temperature transition of magnetite in a magnetic field and its influence on the magnetoresistance

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