Ferro-spin-glass domain model for disordered Ni-Mn

Kouvel, J. S.; Abdul-Razzaq, W.; Ziq, Kh. A.

doi:10.1103/physrevb.35.1768

Cited by 61 publications

(19 citation statements)

References 19 publications

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“…[12][13][14][15][16] Most research effort has fo- cused on ferromagnetic/antiferromagnetic interfaces where there is an additional term in the magnetic energy density arising from exchange coupling between the ferromagnetic and antiferromagnetic spins at the interface. In the simplest case it is possible to show that this additional unidirectional anisotropy term leads to an exchange bias field of 12,13 where 0 =4 ϫ 10 −7 N / A 2 , ⌬ is the interfacial unidirectional energy density, M FM is the saturated ferromagnetic moment, and t FM is the thickness of the ferromagnetic layer.…”

Section: Results and Analysismentioning

confidence: 99%

“…It has been argued that including a Dzyaloshinsky-Moriya term can result in unidirectional anisotropy and hence an exchange bias B E . 14,15 The situation in Sr 4 Fe 4 O 11 is more complicated because of Fe͑1͒ moment spin frustration and Fe͑2͒ moment antiferromagnetic order. Thus, B E could possibly arise from Fe͑1͒ spin-glass clusters.…”

Section: Results and Analysismentioning

confidence: 99%

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Magnetic and transport properties ofSrFeOx

2009

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We report the results from magnetic and transport measurements on SrFeO x where we focus on oxygen contents about the Sr 4 Fe 4 O 11 phase ͑x = 2.75͒ that antiferromagnetically orders at ϳ230 K. We find an exchange-bias-like effect in Sr 4 Fe 4 O 11 that commences near the Fe͑2͒ moment Néel temperature ͑ϳ230 K͒. While there is a weak spin-glass component, possibly arising from spin-frustrated moments on the Fe͑1͒ sites, the spin-glass temperature is significantly less than 230 K, and hence the exchange-bias-like effect is unlikely to be due to a spin glass. The exchange-bias-like effect clearly arises from an exchange interaction term that includes the Fe͑2͒ spins but its exact nature is not clear and awaits a detailed theoretical study. Roomtemperature thermopower measurements show a large change in sign for oxygen contents on either side of the Sr 4 Fe 4 O 11 phase, which we show can be qualitatively interpreted by assuming that the Fermi level is within a narrow band. High-field resistivity measurements show a large magnetoresistance that commences near the Sr 4 Fe 4 O 11 Néel temperature.

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Section: Results and Analysismentioning

confidence: 99%

Section: Results and Analysismentioning

confidence: 99%

Magnetic and transport properties ofSrFeOx

2009

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“…[28][29][30] The reentrant spin glass effect was studied by a number of researchers. [31][32][33][34] Starting from the early observations by Kaya and Kussmann 35 and Sidorov and Doroshenko, 36 several studies have concentrated on the ordering process in the range of Ni of 60%-80%. The author has discussed the role of deposition parameters and the magnetic properties of electrodeposited Ni-Mn alloys elsewhere.…”

Section: Introductionmentioning

confidence: 99%

Induced ordering in electrodeposited nanocrystalline Ni–Mn alloys

Rossi

Nasi

Ferrari

et al. 2008

Journal of Applied Physics

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The Ni 3 Mn type of ordering in nanocrystalline NiMn films with different compositions prepared by electrodeposition was investigated by using x-ray diffraction, differential scanning calorimetry ͑DSC͒, thermogravimetric analyzer, Mössbauer spectroscopy, and transmission electron microscopy. The investigations reveal the existence of composition-induced Ni 3 Mn-type ordering in the as-deposited film of 76.2 at. % Ni. The atomic disorder is characterized by an exothermic effect in DSC. An analysis of the broad exothermic transition reveals the stages of phase transformation leading to ordering. The Curie temperatures of the alloys were determined from thermomagnetic measurements, the maximum value obtained for the ordered sample. Mössbauer spectroscopy at room temperature reveals ordered ͑ferromagnetic͒ and disordered ͑paramagnetic͒ phases in the as-deposited films. Superlattice reflections observed in selected area electron diffraction pattern for the 76.2 at. % Ni film alone further support the observation of composition-specific atomic ordering.

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“…16,17 This phase has a high magnetic frustration or the inability of moments to change with an applied field, which is not the case with the concentrations studied here ͑Fig. 4͒.…”

Section: Resultsmentioning

confidence: 86%

Local and nonlocal magnetic behavior of dilute manganese-doped nickel alloys

Podolak¹,

Willis²,

Wilson³

et al. 2009

Journal of Applied Physics

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We report magnetic behavior of a dilute ferromagnetic alloy Ni1−xMnx, 0<x<25%. Magnetic circular dichroism (MCD) is used to examine the local magnetic moment on each element, and superconducting quantum interference device magnetometry is used to evaluate the magnetization of the alloy as a whole. Both MCD and hysteresis loops show a collapse in moment at x≈15% measured at 100 K. The Mn doping appears to disturb the long-range ordering of the host nickel spins which, in the concentration range studied, is a precursor disordered ferromagnet prior to a spin-glass phase.

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Ferro-spin-glass domain model for disordered Ni-Mn

Cited by 61 publications

References 19 publications

Magnetic and transport properties ofSrFeOx

Magnetic and transport properties ofSrFeOx

Induced ordering in electrodeposited nanocrystalline Ni–Mn alloys

Local and nonlocal magnetic behavior of dilute manganese-doped nickel alloys

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