Growth of epitaxial (001) superlattice films

Isberg, P.; Hjörvarsson, Bjørgvin; Wäppling, R.; Svedberg, Erik B.; Hultman, Lars

doi:10.1016/s0042-207x(97)00003-1

Cited by 127 publications

(118 citation statements)

References 13 publications

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“…The first type are among the most perfect multilayers that one can presently grow with unprecedented interface sharpness [15][16][17]. The second type is a combination of an amorphous metal and an oxide layer, which is of high interest for spin polarized electron tunnelling [18].…”

Section: Methodsmentioning

confidence: 99%

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Information on in- and out-of-plane correlated roughness in multilayers from x-ray specular reflectivity

Romanov¹,

Ul’yanov²,

Uzdin³

et al. 2008

J. Phys. D: Appl. Phys.

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Specular reflectivity measurements of artificial multilayers often exhibit a broadening of high order Bragg peaks and an intensity drop off that is slower than expected from the q −4 Fresnel dependence modified with a static Debye-Waller factor accounting for the interfacial roughness. This behaviour is described on the basis of a model that takes into account the finite size of the detector slit, which determines the instrumental resolution. The amplitude of the interface roughness as well as the in-and out-of-plane correlation lengths strongly affect the shape of the specular x-ray spectra. Information about in-plane and out-of-plane correlated roughness can be obtained, therefore, not only from diffuse scattering data but also from the quasi-specular reflectivity by relaxing the instrumental resolution. Moreover, for systems with short correlation lengths, quasi-specular reflectivity scans are more informative than rocking curves across Bragg reflections. The model is applied to the interpretation of x-ray scattering results on two multilayer systems: MgO(0 0 1)/[Fe(2 ML)/V(16 ML)] 30 and Si/SiO 2 /[CoFeB(3 nm)/MgO(1.5 nm)] 15 . The simulation of the experimental reflectivity scans properly describes the broadening of the higher order Bragg peaks, the damping of Kiessig fringes, and the increased intensity at higher scattering vectors as compared with the purely specular reflectivity.

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Section: Methodsmentioning

confidence: 99%

“…• C, following the procedures described in [15]. The multilayers were deposited on polished MgO(0 0 1) substrates, starting with the vanadium layer and finishing with two ML of Fe.…”

Section: Methodsmentioning

confidence: 99%

Information on in- and out-of-plane correlated roughness in multilayers from x-ray specular reflectivity

Romanov¹,

Ul’yanov²,

Uzdin³

et al. 2008

J. Phys. D: Appl. Phys.

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“…[17]. To enhance the magnetic signal they were deposited as twenty five bilayer sequences of Fe(2 ML)/V(y ML) and ten repetitions of Fe(2 ML)/V(y ML)/Fe(3 ML)/V(y ML).…”

Section: Methodsmentioning

confidence: 99%

“…• C and outgassing at this temperature for 15 min [16,17]. The principal materials were deposited at 330…”

Section: Methodsmentioning

confidence: 99%

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Coupling in Fe(2 ML)/V(y ML) and Fe(2 ML)/V(y ML)/Fe(3 ML)/V(y ML) (y ≥ 4) superlattices

Paul¹

2007

Open Physics

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Fe(2 ML)/V(y ML) and interleaved Fe(2 ML)/V(y ML)/Fe(3 ML)/V(y ML) superlattice systems with spacer thicknesses, y, (4 ≤ y ≤ 17) were investigated macro-magnetically to estimate the coupling strength and the magnetoresistance in these materials, and particularly in the antiferromagnetically coupled monolayers. The results from the magnetic and magnetoresistive measurements indicate that adding one monolayer of Fe increases the antiferromagnetic coupling and the magnetoresistivity ratio from 0.0075 mJ/m 2 at 20 K and 2 % at 10 K for Fe(2 ML)/V(y ML), to 0.05 mJ/m 2 and 2.5 % for Fe(2 ML)/V(y ML)/Fe(3 ML)/V(y ML) at the same temperatures. Both systems exhibit in-plane magnetic and magnetoresistive isotropy, therefore the increase of the conferred physical parameters is attributed mainly to the stresses at the interface as governing mechanisms over the magnetoelastic forces.

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Curie Temperature and Critical Exponent ? in a Fe2/V5 Superlattice

Rüdt

Poulopoulos

Baberschke

et al. 2002

phys. stat. sol. (a)

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For a superlattice of 2 monolayers (ML) Fe and 5 ML V with a repetition rate of 50 [(Fe 2 /V 5 ) 50 ] the low-frequency ac susceptibility c exp was measured. To determine the correct Curie temperature T C and the real critical exponent g it is important to use (i) a very slow temperature scan rate of 5 mK/s, (ii) very small oscillatory magnetic fields below 4 A/m (%50 mG) and (iii) not to perform a power law fit for the determination of T C and g, but rather determine both quantities independently. The onset of hysteresis losses defines T C = 304.75 K. The analysis yields a critical exponent g ¼ 1.72(10), which is in excellent agreement with the theoretically predicted value of the twodimensional (2D) Ising model. No crossover to 3D behavior close to T C is observed. This suggests a vanishing interlayer exchange coupling at T C .Introduction There exists only few experimental work on the paramagnetic susceptibility above T C for ultrathin ferromagnetic films. Moreover, for a precise determination of the real g an exact knowledge of the phase-transition temperature T C is required. It was previously shown that the (Fe n V m ) superlattice is one of the most perfect superstructures with atomically flat interfaces [1]. Here we choose 2 ML Fe only, because it is the thinnest possible ferromagnetic film with symmetric interfaces. The question arises, if this system shows a 2D-like behavior in the paramagnetic regime, i.e. a 2D critical exponent g, and if so, will there be a dimensional crossover to 3D behavior as it has been shown for classical systems [2]. Following standard interpretation [2] such a crossover is controlled by the two competing exchange interactions, the intralayer exchange (in the 2 ML Fe film) and the perpendicular interlayer exchange coupling (between two Fe films) across 5 ML V.In this work we determine the exponent g out of a power law analysis of the internal susceptibility

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Growth of epitaxial (001) superlattice films

Cited by 127 publications

References 13 publications

Information on in- and out-of-plane correlated roughness in multilayers from x-ray specular reflectivity

Information on in- and out-of-plane correlated roughness in multilayers from x-ray specular reflectivity

Coupling in Fe(2 ML)/V(y ML) and Fe(2 ML)/V(y ML)/Fe(3 ML)/V(y ML) (y ≥ 4) superlattices

Curie Temperature and Critical Exponent ? in a Fe2/V5 Superlattice

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