The magnetic phase diagram of CuMn

Gibbs, P.; Harders, T.M.; Smith, J. H.

doi:10.1088/0305-4608/15/1/022

Cited by 64 publications

(54 citation statements)

References 41 publications

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“…The crystal structure is fcc with the lattice constant a = 3.767Å at room temperature. For the alloy of the same Mn content the temperature of the spin-glass freezing is T F = 156 K for the quenched powder sample and T F = 161 K for the aged powder sample [17]. We assume that freezing temperature of our sample is contained in this temperature range.…”

Section: Sample Characteristics and Experimental Detailsmentioning

confidence: 99%

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Diffuse Neutron Scattering in the Mn_0.4Cu_0.6Alloy

Jankowska-Kisielińska

Mikke

Fijał-Kirejczyk

2008

Acta Phys. Pol. A

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The diffuse neutron scattering in the Mn 0.4 Cu 0.6 alloy was measured in the temperature range 15-390 K at the 3-axis neutron spectrometer at MARIA reactor inŚwierk. The broad maxima of the neutron intensity were observed in the surrounding of the (0.5,1,0) reciprocal lattice point and other symmetry related points. The effect is similar to that observed in Mn-Cu alloys with lower Mn content at room temperature. Our results are in agreement with the earlier finding that the maxima of the short--range order incommensurate spin density wave scattering are placed at the (0.5 ± δ,1,0) reciprocal lattice point with a linear dependence of δ on the Mn concentration. In addition, some commensurate antiferromagnetic short--range order was found.

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Section: Sample Characteristics and Experimental Detailsmentioning

confidence: 99%

“…An ASRO increases after aging at 400-500 K. It causes an increase in the freezing temperature (T F ) and the maximum value of the magnetic susceptibility at T F [16,17]. This effect is most pronounced for Mn concentration range 0.15-0.25.…”

Section: Introductionmentioning

confidence: 99%

Diffuse Neutron Scattering in the Mn_0.4Cu_0.6Alloy

Jankowska-Kisielińska

Mikke

Fijał-Kirejczyk

2008

Acta Phys. Pol. A

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“…Mn is an ideal choice as electronic band-structure calculations have shown that the Mn atoms possess almost a 100% spin polarization at the Fermi level. 18,19 In this paper, we focus on the interface effect which, through the contact between Co, Cu, and Mn atoms, favors a direct hybridization and therefore induces ferromagnetism in Mn and Cu. We investigate the Cu and Mn 3d magnetic profiles in a ͓Co/ CuMn͑20 Å͔͒ 20 multilayer ͑ML͒ where there is direct contact between the ferromagnet and the paramagnetic layers.…”

Section: Introductionmentioning

confidence: 99%

Spin polarization and exchange coupling of Cu and Mn atoms in paramagnetic CuMn diluted alloys induced by a Co layer

et al. 2010

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Using the surface, interface, and element specificity of x-ray resonant magnetic scattering in combination with x-ray magnetic circular dichroism, we have spatially resolved the magnetic spin polarization, and the associated interface proximity effect, in a Mn-based high-susceptibility material close to a ferromagnetic Co layer. We have measured the magnetic polarization of Mn and Cu 3d electrons in paramagnetic CuMn alloy layers in ͓Co/ Cu͑x͒ / CuMn/ Cu͑x͔͒ 20 multilayer samples with varying copper layer thicknesses from x =0 to 25 Å. The size of the Mn and Cu L 2,3 edge dichroism shows a decrease in the Mn-induced polarization for increasing copper thickness indicating the dominant interfacial nature of the Cu and Mn spin polarization. The Mn polarization is much higher than that of Cu. Evidently, the Mn moment is a useful probe of the local spin density. Mn atoms appear to be coupled antiferromagnetically with the Co layer below x = 10 Å and ferromagnetically coupled above. In contrast, the interfacial Cu atoms remain ferromagnetically aligned to the Co layer for all thicknesses studied.

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“…Firstly, the effectiveness of aging in increasing the low-temperature magnetisation (which correlates with ASRO development [4]) was found to be maximum at this composition [7]. Secondly, Cu 4 Mn is one of the superlattices generated by a concentration wave in the (420) series, based on the stacking of (210)-type planes, exhibiting ( [8].…”

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confidence: 87%

Long-range atomic order in irradiated Cu ₈₀ Mn ₂₀

Cussen¹,

Gray²,

Murani³

et al. 2002

Europhys. Lett.

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Abstract. -Atomic short-range order is commonly observed in CuMn alloys via a diffuse (1 1 2 0) peak in neutron diffraction patterns. There has been speculation for many years on the existence and nature of any corresponding long-range order. A sample of Cu80Mn20 has been irradiated in a high fast-neutron flux to produce a large number of crystal defects at around room temperature and thus facilitate the ordering process. Measurements of the diffuse neutron scattering from this sample demonstrate that long-range order has been induced in the sample, as evidenced by at least five Bragg peaks. This order is not seen in a reference sample prepared in identical fashion except for the irradiation. The Cowley short-range order parameters for both samples are calculated and a candidate structure for the long-range order is proposed.Introduction. -CuMn alloys display a rich variety of magnetic behaviours and have stimulated interest since the 1930s. Most interest has centred on the γ-phase, a disordered face-centred cubic lattice with a one atom basis, which can be retained at room temperature over a very wide concentration range. A large part of the interest in CuMn has been in the atomic short-range order (ASRO) and accompanying magnetic short-range order shown to be present in the system by many neutron scattering experiments, e.g. [1][2][3]. CuMn alloys are ideal candidates for neutron scattering studies of short-range order because Mn and Cu atoms have similar size and Mn and Cu have large neutron scattering lengths of opposite signs. Short-range order is evidenced by strong diffuse peaks around (h

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The magnetic phase diagram of CuMn

Cited by 64 publications

References 41 publications

Diffuse Neutron Scattering in the Mn_0.4Cu_0.6Alloy

Diffuse Neutron Scattering in the Mn_0.4Cu_0.6Alloy

Spin polarization and exchange coupling of Cu and Mn atoms in paramagnetic CuMn diluted alloys induced by a Co layer

Long-range atomic order in irradiated Cu ₈₀ Mn ₂₀

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The magnetic phase diagram of CuMn

Cited by 64 publications

References 41 publications

Diffuse Neutron Scattering in the Mn0.4Cu0.6Alloy

Diffuse Neutron Scattering in the Mn0.4Cu0.6Alloy

Spin polarization and exchange coupling of Cu and Mn atoms in paramagnetic CuMn diluted alloys induced by a Co layer

Long-range atomic order in irradiated Cu 80 Mn 20

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Diffuse Neutron Scattering in the Mn_0.4Cu_0.6Alloy

Diffuse Neutron Scattering in the Mn_0.4Cu_0.6Alloy

Long-range atomic order in irradiated Cu ₈₀ Mn ₂₀