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28 Dec 1998

Volume 73, Issue 26, pp. 3803-3961

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Engineering of the magnetic properties of strained quantum dots

Jacob B. Khurgin, F. Jin, and A. Obeidat

Appl. Phys. Lett. 73, 3944 (1998); http://dx.doi.org/10.1063/1.122944 (3 pages) | Cited 2 times

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Exchange interactions between the holes confined in arrays of strained quantum dots subject to compressive and tensile strain are shown to lead to ferrimagnetic arrangement of magnetic moments. Using example of strained In1−xGaxAs quantum dots on InP substrate, it is shown how magnetic properties of a semiconductor material can be engineered without resorting to doping with magnetic ions, and the Curie temperature is estimated to be of the order of 25 K. Potential applications in information storage and processing are considered. © 1998 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Pp Magnetic semiconductors
75.50.Gg Ferrimagnetics
75.80.+q Magnetomechanical effects, magnetostriction
75.30.Et Exchange and superexchange interactions
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.10.Lp Band and itinerant models
75.30.Cr Saturation moments and magnetic susceptibilities

Probing submicron nanomagnets by magneto-optics

R. P. Cowburn, D. K. Koltsov, A. O. Adeyeye, and M. E. Welland

Appl. Phys. Lett. 73, 3947 (1998); http://dx.doi.org/10.1063/1.122945 (3 pages) | Cited 53 times

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A hybrid magneto-optical magnetometer and optical microscope has been designed and constructed for probing the magnetic properties of submicron nanomagnets. 10-nm-thick square nanomagnets have been fabricated individually and in small arrays from Ni80Fe14Mo5 (“supermalloy”) by electron-beam lithography. Hysteresis loops with a good signal-to-noise ratio have been obtained from individual nanomagnets as small as 400 nm and from (5 μm)2 arrays of nanomagnets ranging in size from 500 to 75 nm. © 1998 American Institute of Physics.
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75.50.Kj Amorphous and quasicrystalline magnetic materials
78.20.Ls Magneto-optical effects
07.55.Jg Magnetometers for susceptibility, magnetic moment, and magnetization measurements
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Bb Fe and its alloys
07.60.Pb Conventional optical microscopes
78.66.Bz Metals and metallic alloys

Electronic transport properties of (001)/(110) oriented La2/3MnO3−δ thin films

Chun-Che Chen and Alex de Lozanne

Appl. Phys. Lett. 73, 3950 (1998); http://dx.doi.org/10.1063/1.122946 (3 pages) | Cited 10 times

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We report the unusual transport properties found in La2/3MnO3−δ thin films on Al2O3 (1math02). Powder x-ray diffraction shows that the film has a mixture of perpendicular (110) and (001) crystal orientations. Unlike epitaxial or polycrystalline La1−xMnO3−δ samples, in which the peak resistance temperature Tp shifts toward a higher temperature under the influence of magnetic field, the Tp of this particular film remains almost the same even in fields up to 5 T. The film becomes insulating at a low temperature Tm( ∼ 45 K), but the trend is reversed by the applied magnetic field. © 1998 American Institute of Physics.
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73.61.At Metal and metallic alloys
68.55.-a Thin film structure and morphology
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