Ferromagnetismus und Phasengestaltung im Zweistoffsystem Nickel-Mangan

Kaya, Seiji; Kussmann, A.

doi:10.1007/bf01341952

Cited by 110 publications

(9 citation statements)

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“…Since ordering is known to occur for Ni-Mn alloys somewhere in the range of 60 to 82 at. % of Ni, 35,42 this exothermic region was investi- gated further. In order to understand the hidden features of the broad exothermic region observed, the DSC scan for the sample with 82.4 at.…”

Section: B Dsc Studiesmentioning

confidence: 99%

“…[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%

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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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Section: B Dsc Studiesmentioning

confidence: 99%

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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“…For 55 Mn in RbMnF 3 (1) is reversed since (2) gives, at 4.2°K in moderate external fields, o) c /2ir£&0A6 kHz while 2 <ACO 2 ) 1 / 2 /2TT^27.5 kHz; so the linewidth should be given by the SN second moment, as is the case. 3 The difference between the two cases comes from the facts that the anisotropy field in MnF 2 is about 2X10 3 times greater than in RbMnF 3 , so that the AFMR frequency is correspondingly much higher, and the nuclear polarization of 19 F in MnF 2 is about 10 times less than thatof 55 Mn.…”

Section: Introductionmentioning

confidence: 95%

“…[1][2][3][4][5][6][7][8] In the disordered Ni-Mn alloys, the magnetization rises at low concentrations of Mn, reaches a peak at around 10 at.% Mn, and then decreases quite rapidly to a relatively low value at about 30% Mn. As has been…”

Section: Introductionmentioning

confidence: 99%

Nuclear Spin-Wave Relaxation and Narrowing of NMR Lines in Ferro- and Antiferromagnets

Richards

1968

Phys. Rev.

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It is shown that if a well-defined nuclear spin-wave spectrum exists in a ferro-or antiferromagnet, the NMR linewidth is considerably narrower than would be calculated from the second moment (Aw 2 ) due to the Suhl-Nakamura interaction. We argue that if the frequency pulling co c is large compared to (Aw 2 ) 1/2 , only a small band of nearly degenerate modes can interact; so the situation is analogous to standard transitionprobability calculations. This explains why the observed NMR linewidth in RbMnF 3 is an order of magnitude smaller than (Aw 2 ) 1/2 . Nuclear spin-wave relaxation rates are calculated for RbMnF s . For zero wave vector the rate is 1.5X10 3 sec" 1 at 4.2°K in a field of 3000 Oe. This figure is much less than the NMR width, but is in close agreement with parallel-pumping data. It is suggested that the NMR width may be due largely to random inhomogeneities.

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“…Its magnetic properties are strongly dependent on the degree of order, and many studies have been accumulated [1][2][3][4][5][6] since its discovery by Kaya and Kussmann [1]. In most of those studies, alloy samples were made using conventional technique of melting the metal elements in a furnace.…”

Section: Introductionmentioning

confidence: 99%