Giant Magnetoresistance by Exchange Springs in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>DyFe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi>/</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi>YFe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Superlattices

Gordeev, S.N.; Beaujour, J.-M. L.; Bowden, G. J.; Rainford, B.D.; Groot, P.A.J. de; Ward, R. C. C.; Wells, M. R.; Jansen, A. G. M.

doi:10.1103/physrevlett.87.186808

Cited by 71 publications

(31 citation statements)

References 14 publications

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“…(Similar measurements of individual Co nanowires were made by Vila et al [276].) Walls of controlled size were formed in Co wires by growing them on a GdCo 1.6 substrate to create an exchange spring structure [302], a similar technique to that employed in the multilayers [243,245] discussed above in §4.3.2. This structure gives just the same sort of domain wall parallel to the interface, which these authors call a Zeeman domain wall, the thickness of which can be controlled by varying the applied field -in this paper the range studied was from 10 down to 5 nm thickness.…”

Section: Mesoscopic Devicesmentioning

confidence: 75%

“…Just as in the DyFe 2 /YFe 2 multilayers [243], in-plane spring domain walls can be formed, although it was found that these played a rather minor role in the transport in this particular case. The MR was predicted based on the Valet-Fert model [76], with the angle between the Fe and Gd moments at the interface based on a simple micromagnetic model.…”

Section: Heterostructuresmentioning

confidence: 87%

“…Gordeev et al have studied the magnetoresistance of epitaxially grown DyFe 2 /YFe 2 multilayers [243]. In the magnetically hard DyFe 2 , the Dy and Fe moments will couple antiferromagnetically, giving a ferrimagnetic material: this is commonplace for the coupling between a heavy 4f and a 3d moment in alloys.…”

Section: Heterostructuresmentioning

confidence: 99%

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Spin-polarised currents and magnetic domain walls

Marrows

2005

Advances in Physics

216

163

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Electrical currents flowing in ferromagnetic materials are spinpolarised as a result of the spin-dependent band structure. When the spatial direction of the polarisation changes, in a domain structure, the electrons must somehow accommodate the necessary change in direction of their spin angular momentum as they pass through the wall. Reflection, scattering, and a transfer of angular momentum to the lattice are all possible outcomes, depending on the circumstances. This gives rise to a variety of different physical effects, most importantly a contribution to the electrical resistance caused by the wall, and a motion of the wall driven by the spin-polarised current.Historical and recent research on these topics is reviewed. * Phone: +44(0)113 3433780

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Section: Mesoscopic Devicesmentioning

confidence: 75%

Section: Heterostructuresmentioning

confidence: 87%

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Spin-polarised currents and magnetic domain walls

Marrows

2005

Advances in Physics

216

163

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“…However the MR is small ͑1.5%͒ and dominated by anisotropic magnetoresistance ͑AMR͒. Gordeev et al 3 demonstrated that the formation of short exchange springs in the YFe 2 / TbFe 2 superlattice results in a large magnitude of MR as high as 32%. In general, the directions of magnetization in consecutive layers can be switched when a magnetic field is applied, and MR changes dramatically as a whole.…”

Section: Introductionmentioning

confidence: 99%

The enhanced negative magnetoresistance of Fe/Tb multilayer at multiextreme conditions

Ohashi

Oomi

Ohmichi

et al. 2008

Journal of Applied Physics

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Magnetoresistance ͑MR͒ in Fe/Tb magnetic multilayer is studied under multiextreme conditions, i.e., high magnetic field, low temperature, and high pressure. The negative MR is observed to be 24.6% in ͓Fe͑12 nm͒ / Tb͑15 nm͔͒ 25 at 4.2 K, and MR is not saturated completely even up to 30 T. With increasing pressure, the magnitude of MR tends to be suppressed, indicating that magnetic order in the Tb layers is suppressed by applying pressure.

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“…They display a rich variety of features, including exchange spring induced giant magnetoresistance. 9 But more features continue to be discovered. For example, X-ray Magnetic Circular Dichroism (XMCD) studies on a YFe 2 dominated DyFe 2 /YFe 2 system reveal complex magnetization reversal processes.…”

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confidence: 99%

Exchange spring driven spin flop transition in ErFe2∕YFe2 multilayers

Martin

Wang

Bowden

et al. 2006

Applied Physics Letters

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Abstract.Magnetization loops for (110) MBE grown ErFe 2 /YFe 2 multilayer films are presented and discussed. The magnetocrystalline easy axis for the Er layers is parallel to a <111> type crystal axis, with the out of plane <111> axes favoured by the strain. For fields applied along the (110) crystal growth axis, out-of-plane magnetic exchange springs are set up in the magnetically soft YFe 2 layers. For multilayer films that display exchange spring dominated reversal at low temperatures, there is a cross-over temperature above which there are additional transitions at high fields. These features are interpreted using micro-magnetic modelling. At sufficiently high fields, applied perpendicular to the multilayer film plane, the energy is minimized by an exchange spring driven multilayer spin flop. In this state, the average magnetization of the ErFe 2 layers switches into a nominally hard in-plane <111> axis, perpendicular to the applied field.

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Giant Magnetoresistance by Exchange Springs inDyFe2/YFe2Superlattices

Cited by 71 publications

References 14 publications

Spin-polarised currents and magnetic domain walls

Spin-polarised currents and magnetic domain walls

The enhanced negative magnetoresistance of Fe/Tb multilayer at multiextreme conditions

Exchange spring driven spin flop transition in ErFe2∕YFe2 multilayers

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