Giant magnetoresistance in Fe/Cr superlattices with very thin Fe layers

Schad, R.; Potter, C. D.; Beliën, P.; Verbanck, G.; Moshchalkov, Victor; Bruynseraede, Y.

doi:10.1063/1.111253

Cited by 147 publications

(53 citation statements)

References 19 publications

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“…The calculated MR values in the CIP geometry in the ballistic regime [76] were much smaller than the highest experimental values of 115% for Co/Cu multilayers [202] and 220% for Fe/Cr multilayers [203] indicating that some additional scattering mechanism is important. Using a single-band tight-binding model, Asano et al [190] found that, unlike in the CPP case, the CIP MR did depend critically on interface defect scattering.…”

Section: Ballistic Gmrmentioning

confidence: 89%

Non-collinear magnetoelectronics

2006

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The electron transport properties of hybrid ferromagnetic|normal metal structures such as multilayers and spin valves depend on the relative orientation of the magnetization direction of the ferromagnetic elements. Whereas the contrast in the resistance for parallel and antiparallel magnetizations, the so-called Giant Magnetoresistance, is relatively well understood for quite some time, a coherent picture for non-collinear magnetoelectronic circuits and devices has evolved only recently. We review here such a theory for electron charge and spin transport with general magnetization directions that is based on the semiclassical concept of a vector spin accumulation. In conjunction with first-principles calculations of scattering matrices many phenomena, e.g. the currentinduced spin-transfer torque, can be understood and predicted quantitatively for different material combinations.

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Section: Ballistic Gmrmentioning

confidence: 89%

Non-collinear magnetoelectronics

2006

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“…For the present example the relatively low value for p Τ and the significant value for p J, is again favorable for a large GMR [51]. Therefore for Fe/Cr, being todays record GMR system [48], this simple procedure works out quite well. However, this appears to be fortuitous and not generally applicable.…”

Section: T O T H E O R I G I N a L H Y P O T H E S I S O Fsmentioning

confidence: 95%

“…Values of 0.1% for V and Mo based multilayers are found whereas the record value today is 220% for the Fe/Cr system [48]. Closer examination of the various multilayer systems which have been studied so far, learns that for the magnitude of the GMR effect the material combination is crucial.…”

Section: Experimental Observationsmentioning

confidence: 99%

Interlayer Exchange Coupling and Giant Magnetoresistance in Magnetic Multilayers

Bloemen

1996

Acta Phys. Pol. A

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An introduction is given on the subject of magnetic metallic multilayers. These artificial structures appear to display several fascinating physical phenomonena which are of fundamental as well as technological interest. Two examples, the magnetic coupling between ferromagnetic layers across a non-magnetic spacer layer and the giant magnetoresistance are emphasized in this article. For each of these, key experimental observations are reviewed followed by a discussion of the physical principles underlying the phenomenon.

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“…A 30 nm thick Cr(0 0 1) buffer layer grown at 450 • C and subsequently annealed at 750 • C is necessary for a good epitaxial growth of the Co/Cr/Fe spin valve structure. Cr exhibits a so-called 45 • -epitaxy on MgO(0 0 1) with the [1 0 0] crystallographic axes of both materials being aligned at an angle of 45 • to each other [9].…”

Section: Sample Preparationmentioning

confidence: 99%

Magnetization reversal and magnetic interactions in patterned spin valve structures

Brüssing¹,

Nowak²,

Schumann³

et al. 2009

J. Phys. D: Appl. Phys.

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We have investigated the magnetization reversal and the magnetic anisotropy of epitaxial Co(1 12 0) and Fe(0 0 1) films and compared them with epitaxial Co(1 12 0)/Cr(0 0 1)/Fe(0 0 1) trilayers with spin valve characteristics. Furthermore, by e-beam lithography we have cut the single layers and the trilayers into the shape of wires to study the effect of the shape anisotropy and the dipolar interaction between the wires on their switching characteristics. We found that patterning very much affects the magnetization reversal of the single films by introducing an additional anisotropy term. Dipolar interaction between the different wires may exist but is less obvious. However, the remagnetization process of the patterned trilayers resembles more those of the continuous single films than a combination of the Co and Fe wires. We argue that this is due to a weak but remaining interlayer exchange coupling between Co and Fe, mediated by the intervening Cr layer.

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Giant magnetoresistance in Fe/Cr superlattices with very thin Fe layers

Cited by 147 publications

References 19 publications

Non-collinear magnetoelectronics

Non-collinear magnetoelectronics

Interlayer Exchange Coupling and Giant Magnetoresistance in Magnetic Multilayers

Magnetization reversal and magnetic interactions in patterned spin valve structures

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