Roughness and giant magnetoresistance in Fe/Cr superlattices

Fullerton, Eric E.; Kelly, David M.; Guimpel, J.; Schuller, Iván K.; Bruynseraede, Y.

doi:10.1103/physrevlett.68.859

Cited by 410 publications

(148 citation statements)

References 17 publications

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“…Furthermore, the structure and interface properties can be well characterized by high-resolution X-ray diffraction and low-angle X-ray reflectometry in a non-destructive manner. In fact, the influence of the interface roughness on the giant magnetoresistance (GMR) of ferromagnetic/non-magnetic metal superlattices has been extensively studied by low-angle X-ray reflectometry [18]. Recently, Jo et al [19] claimed that the transport properties and magnetoresistance in La 0.7 Ca 0.3 MnO 3 /SrTiO 3 superlattices may be related to an inhomogeneous magnetic structure in the manganite layers having magnetically disordered interfaces.…”

Section: Introductionmentioning

confidence: 99%

Structure and transport properties of coherently strained La_2/3Ca_1/3MnO₃/SrTiO₃ superlattices

Klein

Herbstritt

et al. 2005

Physica Status Solidi (b)

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We have prepared high quality, coherently strained La 2/3 Ca 1/3 MnO 3 /SrTiO 3 superlattices with different modulation periods by laser molecular beam epitaxy on (001) SrTiO 3 and NdGaO 3 substrates. A detailed structural characterization was performed by high-angle X-ray diffraction (HAXRD) and low-angle X-ray reflectivity (LAXRR). All superlattices are very flat, show excellent structural coherence and very small mosaic spread (0.02°). The in-plane coherency strain was varied by changing the thickness ratio of the constituent layers allowing for a systematic variation of the resulting tetragonal distortion of LCMO. The c-axis lattice parameter of LCMO could be continuously changed from 3.87 Å to 3.79 Å. The interface roughness was analyzed by offset low-angle X-ray reflectivity and low-angle rocking curve measurements. It was found to be of the order of one unit cell with a significant part of the roughness being vertically correlated. The strain induced tetragonal distortion of LCMO was found to cause strong reduction of the paramagnetic to ferromagnetic transition temperature from about 260 to 120 K and an increase of resistivity. The transport properties in the paramagnetic regime could be well described by a small polaron hopping model. The lattice distortions were found to result in a significant increase of the polaron trapping energy. Our results show that coherently strain superlattices are an interesting model system for the systematic study of the effect of lattice distortions on the magnetic and electronic properties of the doped manganites.

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Section: Introductionmentioning

confidence: 99%

Structure and transport properties of coherently strained La_2/3Ca_1/3MnO₃/SrTiO₃ superlattices

Klein

Herbstritt

et al. 2005

Physica Status Solidi (b)

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“…However, suppression of AF coupling may not necessarily lead to enhanced GMR at elevated pressure because of differing effects that can result from modification of interface roughness. An increase in roughness enhanced GMR in DC-magnetron sputtered Fe/Cr [17] but suppressed GMR in molecular beam epitaxy Fe/Cr were observed [18]. The involved structure in the present case has lower GMR (50.5 %) at 2 GPa than at ambient pressure (54.0 %) [13], showing that the principle mechanism is interface scattering.…”

Section: Applicationmentioning

confidence: 61%

A model of the response of GMR of metallic multilayers to external magnetic field

Uba

Ikeuba

Ekwo

2015

Materials Science-Poland

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It has not been possible to transform resistivity models in terms of magnetic field in order to account for variation of giant magnetoresistance (GMR) with external magnetic field, which would have led to determination of material properties. This problem is approached mathematically via variation calculus to arrive at an exponential function that fits observed GMR values. Using this model in free electron approximation, the mean Fermi vector, susceptibility and total density of states of a number of metallic multilayers are determined from their reported GMR values. Susceptibility is found to depend on interface roughness and antiferromagnetic (AF) coupling; thus, it gives qualitative measure of interface quality and AF coupling. Comparison of susceptibilities and GMRs of electrodeposited and ion beam sputtered Co/Cu structures shows that a rough interface suppresses GMR in the former but enhances it in the latter.

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“…The role of disorder effects, in particular of roughness or interdiffusion across the interface, is still poorly understood and systematic investigations of these effects are lacking. Thus straightforward attempts to correlate important effects such as magnetoresistance, exchange bias and magnetic proximity effects with quantities such as the average roughness appear to show rather contradictory results [89,90]. In the case of exchange bias, for instance, there has been a steady progression of theoretical models to account for the discrepancies between the experimentally realized values and those expected from the most idealized model of the interface.…”

Section: Magnetic Vs Structural Roughnessmentioning

confidence: 99%

Neutron scattering studies of nanomagnetism and artificially structured materials

Fitzsimmons

Bader

Borchers

et al. 2004

Journal of Magnetism and Magnetic Materials

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159

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Roughness and giant magnetoresistance in Fe/Cr superlattices

Cited by 410 publications

References 17 publications

Structure and transport properties of coherently strained La_2/3Ca_1/3MnO₃/SrTiO₃ superlattices

Structure and transport properties of coherently strained La_2/3Ca_1/3MnO₃/SrTiO₃ superlattices

A model of the response of GMR of metallic multilayers to external magnetic field

Neutron scattering studies of nanomagnetism and artificially structured materials

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Roughness and giant magnetoresistance in Fe/Cr superlattices

Cited by 410 publications

References 17 publications

Structure and transport properties of coherently strained La2/3Ca1/3MnO3/SrTiO3 superlattices

Structure and transport properties of coherently strained La2/3Ca1/3MnO3/SrTiO3 superlattices

A model of the response of GMR of metallic multilayers to external magnetic field

Neutron scattering studies of nanomagnetism and artificially structured materials

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Product

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Structure and transport properties of coherently strained La_2/3Ca_1/3MnO₃/SrTiO₃ superlattices

Structure and transport properties of coherently strained La_2/3Ca_1/3MnO₃/SrTiO₃ superlattices