Specific heat of the dilute antiferromagnetic system FexZn1-xF2

Sousa, Lais Landim; Machado, F.L.A.; Montenegro, F. C.; Rezende, S. M.

doi:10.1088/1742-6596/200/3/032069

J. Phys.: Conf. Ser.

2010

DOI: 10.1088/1742-6596/200/3/032069

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Specific heat of the dilute antiferromagnetic system Fe_xZn_1-xF₂

Lais Landim Sousa

F.L.A. Machado

F. C. Montenegro

et al.

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Cited by 3 publications

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“…7 in Ref. 1 ) and that the Néel temperature decreases linearly from that of FeF 2 (T N = 78.4 K) with increasing x as has been observed earlier 24,25 . Figure 1c,d shows the temperature dependence of the low field magnetic susceptibility χ = M/H recorded after ZFC and FC protocol in H = 5 Oe and 100 Oe for two different orientations, parallel (||c) ( Fig.…”

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confidence: 70%

Random fields and apparent exchange bias in the dilute Ising antiferromagnet Fe0.6Zn0.4F2

Joshi

Nordblad

Mathieu

2020

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Random field induced spontaneous excess moments appear in field cooled single crystals of diluted Ising antiferromagnets. Here we report results from low temperature measurements of field cooled (including zero field) magnetic hysteresis loops parallel and perpendicular to the c-axis of a single crystal of composition Fe 0.6 Zn 0.4 f 2. We find that weak static ferromagnetic excess moments attained on field cooling give rise to an apparent exchange bias of the magnetic hysteresis loops, whose magnitude is controlled by temperature and the strength and direction of the cooling field. Random field induced temporal excess moments only become observable in cooling fields larger than 1 T applied along the c-axis direction of the Fe 0.6 Zn 0.4 f 2 single crystal. The antiferromagnet FeF 2 1 is a physical realization of a model 3d Ising system 2 as well as an important spintronic material 3,4. At temperatures below the Néel temperature, T N = 78.4 K, of FeF 2 an excess magnetic moment develops, that near T N decays with a critical exponent characteristic of 3d Ising systems 5. This excess moment gives rise to an apparent exchange bias associated with the vertical shift of the hysteresis loops occurring when cooling the sample through T N in a finite magnetic field 6. The excess moment is rigidly locked to the cooling field direction and is virtually unaffected by any magnetic field changes in the antiferromagnetic state. This is reflected in a field dependent rapidly saturating thermo-remnant magnetization (TRM) and zero isothermal remnant magnetization (IRM) at all accessible fields and temperatures below T N 6

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confidence: 70%

Random fields and apparent exchange bias in the dilute Ising antiferromagnet Fe0.6Zn0.4F2

Joshi

Nordblad

Mathieu

2020

Sci Rep

View full text Add to dashboard Cite

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Ac magnetic susceptibility measurements in nanoparticulate powders of iron-doped ZnO

Barbosa

Machado

Rodrigues

et al. 2012

Journal of Magnetism and Magnetic Materials

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Magnetic field effect on the fractal cluster spin-glass phase of an Ising antiferromagnet near the first-neighbor percolation threshold: Fe0.25Zn0.75F
Lima
¹
,
Brito
²
,
Barbosa
³

et al. 2012
Phys. Rev. B

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Specific heat of the dilute antiferromagnetic system Fe_xZn_1-xF₂

Cited by 3 publications

References 16 publications

Random fields and apparent exchange bias in the dilute Ising antiferromagnet Fe0.6Zn0.4F2

Random fields and apparent exchange bias in the dilute Ising antiferromagnet Fe0.6Zn0.4F2

Ac magnetic susceptibility measurements in nanoparticulate powders of iron-doped ZnO

Magnetic field effect on the fractal cluster spin-glass phase of an Ising antiferromagnet near the first-neighbor percolation threshold: Fe0.25Zn0.75F
Lima
¹
,
Brito
²
,
Barbosa
³

et al. 2012
Phys. Rev. B

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Specific heat of the dilute antiferromagnetic system FexZn1-xF2

Cited by 3 publications

References 16 publications

Random fields and apparent exchange bias in the dilute Ising antiferromagnet Fe0.6Zn0.4F2

Random fields and apparent exchange bias in the dilute Ising antiferromagnet Fe0.6Zn0.4F2

Ac magnetic susceptibility measurements in nanoparticulate powders of iron-doped ZnO

Magnetic field effect on the fractal cluster spin-glass phase of an Ising antiferromagnet near the first-neighbor percolation threshold: Fe0.25Zn0.75FLima1, Brito2, Barbosa3 et al. 2012Phys. Rev. B

Contact Info

Product

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About

Specific heat of the dilute antiferromagnetic system Fe_xZn_1-xF₂

Magnetic field effect on the fractal cluster spin-glass phase of an Ising antiferromagnet near the first-neighbor percolation threshold: Fe0.25Zn0.75F
Lima
¹
,
Brito
²
,
Barbosa
³

et al. 2012
Phys. Rev. B