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9 Oct 2000

Volume 77, Issue 15, pp. 2271-2423

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Local probing of the giant magnetoresistance

S. J. C. H. Theeuwen, J. Caro, S. Radelaar, L. Canali, L. P. Kouwenhoven, C. H. Marrows, and B. J. Hickey

Appl. Phys. Lett. 77, 2370 (2000); http://dx.doi.org/10.1063/1.1315634 (3 pages) | Cited 3 times

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We have contacted the tip of a scanning tunneling microscope (STM) to a Co/Cu magnetic multilayer to locally measure the giant magnetoresistance (GMR) of the multilayer. Apart from a point-contact GMR, the measured MR also reflects a magnetostriction effect in the STM. The resulting GMR ratios are typically 10%, with occasional ratios up to 60%. We attribute spot-to-spot variations of the ratio to differences in the local structure of the magnetic multilayer. © 2000 American Institute of Physics.
Show PACS
75.47.De Giant magnetoresistance
81.05.Bx Metals, semimetals, and alloys
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
72.15.Gd Galvanomagnetic and other magnetotransport effects
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
73.61.At Metal and metallic alloys
75.80.+q Magnetomechanical effects, magnetostriction
73.40.Jn Metal-to-metal contacts

Néel “orange-peel” coupling in magnetic tunneling junction devices

B. D. Schrag, A. Anguelouch, S. Ingvarsson, Gang Xiao, Yu Lu, P. L. Trouilloud, A. Gupta, R. A. Wanner, W. J. Gallagher, P. M. Rice, and S. S. P. Parkin

Appl. Phys. Lett. 77, 2373 (2000); http://dx.doi.org/10.1063/1.1315633 (3 pages) | Cited 58 times

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We present measurements of the magnitude of Néel “orange-peel” coupling due to interface roughness in a series of magnetic tunneling junction devices. Results from magnetometry and transport measurements are shown to be in good agreement with the theoretical model of Néel. In addition, we have used transmission electron microscopy to directly probe the sample interface roughness and obtain results consistent with the values obtained by magnetometry and transport methods. © 2000 American Institute of Physics.
Show PACS
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.45.+j Macroscopic quantum phenomena in magnetic systems
85.70.-w Magnetic devices
72.15.Gd Galvanomagnetic and other magnetotransport effects
68.35.Ct Interface structure and roughness
73.50.Jt Galvanomagnetic and other magnetotransport effects (including thermomagnetic effects)
73.40.Gk Tunneling

Magnetic domains and twin structure of the La0.7Sr0.3MnO3 single crystal

A. Khapikov, L. Uspenskaya, I. Bdikin, Ya. Mukovskii, S. Karabashev, D. Shulyaev, and A. Arsenov

Appl. Phys. Lett. 77, 2376 (2000); http://dx.doi.org/10.1063/1.1316773 (3 pages) | Cited 22 times

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Using a magneto-optical indicator film imaging technique and an x-ray topography, we have observed a strong correlation between magnetic and twin structure of a single crystal of La0.7Sr0.3MnO3 (LSMO). The correlation between magnetic and twin domains can be understood in terms of a rhombohedral deformation of the cubic cell of LSMO which is accompanied by an occurrence of a magnetic anisotropy. Our data and analysis suggest that twin domains play a fundamental role in a low-field magnetization behavior and in magnetotransport properties of LSMO. © 2000 American Institute of Physics.
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75.50.Dd Nonmetallic ferromagnetic materials
75.60.Ch Domain walls and domain structure
61.72.Mm Grain and twin boundaries
78.20.Ls Magneto-optical effects
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Gw Magnetic anisotropy
75.47.Gk Colossal magnetoresistance

(Ga,Mn)As as a digital ferromagnetic heterostructure

R. K. Kawakami, E. Johnston-Halperin, L. F. Chen, M. Hanson, N. Guébels, J. S. Speck, A. C. Gossard, and D. D. Awschalom

Appl. Phys. Lett. 77, 2379 (2000); http://dx.doi.org/10.1063/1.1316775 (3 pages) | Cited 110 times

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See Also: Erratum

Show Abstract
(Ga,Mn)As digital ferromagnetic heterostructures are grown by incorporating submonolayer planes of MnAs into GaAs using molecular beam epitaxy. Structural and magnetic measurements indicate single-crystalline superlattice structure and ferromagnetic order with Curie temperatures (TC) up to 50 K. By varying the spacing between neighboring Mn layers, we observe that TC initially decreases with increasing spacer thickness, followed by a regime with weak dependence on the spacer thickness. The persistence of ferromagnetism for interlayer spacings of at least 200 ML (∼560 Å) suggests that the individual Mn layers are ferromagnetic. © 2000 American Institute of Physics.
Show PACS
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Dd Nonmetallic ferromagnetic materials
68.65.-k Low-dimensional, mesoscopic, nanoscale and other related systems: structure and nonelectronic properties
75.50.Pp Magnetic semiconductors
81.15.Hi Molecular, atomic, ion, and chemical beam epitaxy
68.35.Ct Interface structure and roughness
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Magnetic pair-making double exchange coupling in Ru substituted orthomanganites, La0.7A0.3Mn0.9Ru0.1O3

Ranjan K. Sahu and S. Sundar Manoharan

Appl. Phys. Lett. 77, 2382 (2000); http://dx.doi.org/10.1063/1.1317539 (3 pages) | Cited 17 times

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A detailed study of Ru substitution at the Mn site in La0.7A0.3Mn0.9Ru0.1O3 (A=Ca, Sr, Pb, Ba) polycrystalline samples shows an unusual magnetic pair between Ru+4/Ru+5 and Mn+4/Mn+3 redox couple. As a result, in the entire 10 at. % Ru-substituted compositions, the TC varies only by 10–30 K. The similarity of Mn4+/Ru4+:eg parentage facilitates a redox interaction between Mn and Ru ions, Ru+4/+5/Mn+3/+4. Ruthenium (IV) low spin state has a magnetic moment of 2.7–2.9μB, and with an extended 4d orbital, it enhances exchange coupling between Mn and Ru sites. © 2000 American Institute of Physics.
Show PACS
75.30.Et Exchange and superexchange interactions
75.47.Gk Colossal magnetoresistance
75.50.Dd Nonmetallic ferromagnetic materials
75.30.Cr Saturation moments and magnetic susceptibilities
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
72.60.+g Mixed conductivity and conductivity transitions
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
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