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3 Mar 2003

Volume 82, Issue 9, pp. 1323-1488

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Appl. Phys. Lett. 82, 1437 (2003); http://dx.doi.org/10.1063/1.1556958 (3 pages)

T. K. Yamada, M. M. J. Bischoff, T. Mizoguchi, and H. van Kempen
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Strain-induced magnetic stripe domains in La0.7Sr0.3MnO3 thin films

Joonghoe Dho, Y. N. Kim, Y. S. Hwang, J. C. Kim, and N. H. Hur

Appl. Phys. Lett. 82, 1434 (2003); http://dx.doi.org/10.1063/1.1556967 (3 pages) | Cited 67 times

Online Publication Date: 25 February 2003

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We have investigated magnetic microstructures of magnetoresistive La0.7Sr0.3MnO3 (LSMO) thin films. Magnetic images are strongly dependent on structural strain induced by the substrates. The LSMO film on SrTiO3 dominated by tensile stress effect displays a feather-like pattern, whereas LSMO films on LaAlO3 and NdGaO3 substrates under compressive stress show stripe domains. In particular, the magnetic image of the film on NdGaO3 reveals distinctive straight stripe domain patterns on the order of about 120 nm, suggesting the presence of a sizable out-of-plane magnetization. The ordering of the stripe domains is also sensitive to the field direction. © 2003 American Institute of Physics.
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75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.70.Ak Magnetic properties of monolayers and thin films
68.37.Rt Magnetic force microscopy (MFM)
68.60.Bs Mechanical and acoustical properties
75.47.Gk Colossal magnetoresistance
75.47.Lx Magnetic oxides
75.30.Gw Magnetic anisotropy

Use of voltage pulses to detect spin-polarized tunneling

T. K. Yamada, M. M. J. Bischoff, T. Mizoguchi, and H. van Kempen

Appl. Phys. Lett. 82, 1437 (2003); http://dx.doi.org/10.1063/1.1556958 (3 pages) | Cited 16 times

Online Publication Date: 25 February 2003

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The present letter describes a method to make a spin-polarized scanning tunneling microscopy tip by applying voltage pulses between a W tip and a magnetic sample. This spin-polarized tip has the similar characteristics as an Fe-coated W tip, which was confirmed by observations of antiferromagnetically coupled ferromagnetic Mn(001) layers (>3 ML) grown on an Fe(001) whisker at 370 K. Furthermore, we demonstrate that these voltage pulses can vary the tip magnetization direction. © 2003 American Institute of Physics.
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07.79.Cz Scanning tunneling microscopes
75.50.Cc Other ferromagnetic metals and alloys
68.37.Ef Scanning tunneling microscopy (including chemistry induced with STM)
68.35.B- Structure of clean surfaces (and surface reconstruction)

Giant magnetothermopower associated with large magnetoresistance in Ag2−δTe

Young Sun, M. B. Salamon, M. Lee, and T. F. Rosenbaum

Appl. Phys. Lett. 82, 1440 (2003); http://dx.doi.org/10.1063/1.1558896 (3 pages) | Cited 7 times

Online Publication Date: 25 February 2003

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We have probed the temperature and magnetic-field dependence of the thermopower and resistance of a p-type silver chalcogenide, Ag2−δTe. The application of a magnetic field causes not only a large magnetoresistance but also a giant magnetothermopower effect. The maximum change of thermopower is as high as 470 μV/K in a 7 T magnetic field. Both the magnetoresistance and the magnetothermopower show a pronounced peak and nearly linear behavior near the sign change of the thermopower. Bandcrossing and quantum confinement due to disorder appear to play key roles in the heightened response to field. © 2003 American Institute of Physics.
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72.20.Pa Thermoelectric and thermomagnetic effects
72.20.My Galvanomagnetic and other magnetotransport effects
72.80.Jc Other crystalline inorganic semiconductors

Magnetic coupling in Co/Cr2O3/CrO2 “trilayer” films

Ruihua Cheng, A. N. Caruso, L. Yuan, S.-H. Liou, and P. A. Dowben

Appl. Phys. Lett. 82, 1443 (2003); http://dx.doi.org/10.1063/1.1558212 (3 pages) | Cited 6 times

Online Publication Date: 25 February 2003

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The ferromagnetic coupling between Co and CrO2, through an insulator (Cr2O3) was characterized by in situ magneto-optic Kerr effect. By evaporating 20–60 Å Co thin films on top of epitaxial CrO2 films, a Co/Cr2O3/CrO2 trilayer system can be readily fabricated; this is possible because the native surface layer of CrO2 is Cr2O3. In situ x-ray photoemission studies show that the Co is oxidized at the interface between Co and Cr2O3, so that the system more resembles Co/CoO/Cr2O3/CrO2. The Co thickness and temperature dependence of the magnetic hysteresis loops indicate that magnetic coupling strength increases with increasing Co thickness and decreases with increasing temperature. The magnetic coupling through the insulator barrier may be related to defect states in the insulating barrier layer. © 2003 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Cc Other ferromagnetic metals and alloys
75.50.Dd Nonmetallic ferromagnetic materials
78.20.Ls Magneto-optical effects
78.66.Bz Metals and metallic alloys
78.66.Nk Insulators
79.60.Jv Interfaces; heterostructures; nanostructures
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
73.20.Hb Impurity and defect levels; energy states of adsorbed species

Enhanced effect of magnetic anisotropy on free clusters

Yuannan Xie and John A. Blackman

Appl. Phys. Lett. 82, 1446 (2003); http://dx.doi.org/10.1063/1.1558211 (3 pages) | Cited 4 times

Online Publication Date: 25 February 2003

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We propose a simple model to estimate the effective moments of free clusters in a magnetic field. Compared with supported clusters, the effect of magnetic anisotropy is significantly enhanced, in good agreement with experimental results. The controversy of relations between the effective moment and cluster temperature presented in experiments is explained within our model. We can evaluate the magnetic anisotropy energies of free clusters from Stern–Gerlach experimental results. © 2003 American Institute of Physics.
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75.30.Gw Magnetic anisotropy
36.40.Cg Electronic and magnetic properties of clusters
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Cr Saturation moments and magnetic susceptibilities
75.50.Tt Fine-particle systems; nanocrystalline materials
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