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25 Aug 2003

Volume 83, Issue 8, pp. 1497-1679

Issue Cover Spotlight Figure

Appl. Phys. Lett. 83, 1671 (2003); http://dx.doi.org/10.1063/1.1604161 (3 pages)

Wenyi Cai, Christopher F. Powell, Yong Yue, Suresh Narayanan, Jin Wang, Mark W. Tate, Matthew J. Renzi, Alper Ercan, Ernest Fontes, and Sol M. Gruner
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Magnetovibrational coupling in small cantilevers

Alexey A. Kovalev, Gerrit E. W. Bauer, and Arne Brataas

Appl. Phys. Lett. 83, 1584 (2003); http://dx.doi.org/10.1063/1.1603338 (3 pages) | Cited 9 times

Online Publication Date: 19 August 2003

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A nanomagnetomechanical system consisting of a cantilever and a thin magnetic film is predicted to display magnetovibrational modes, which should enable applications for sensors and actuators. The “polaritonic” modes can be detected by line splittings in ferromagnetic resonance spectra. © 2003 American Institute of Physics.
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75.80.+q Magnetomechanical effects, magnetostriction
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
75.70.-i Magnetic properties of thin films, surfaces, and interfaces
07.10.Cm Micromechanical devices and systems
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance

Mössbauer effect probe of local Jahn–Teller distortion in Fe-doped colossal magnetoresistive manganites

Zhao-hua Cheng, Zhi-hong Wang, Nai-li Di, Zhi-qi Kou, Guang-jun Wang, Rui-wei Li, Yi Lu, Qing-an Li, Bao-gen Shen, and R. A. Dunlap

Appl. Phys. Lett. 83, 1587 (2003); http://dx.doi.org/10.1063/1.1605232 (3 pages) | Cited 5 times

Online Publication Date: 19 August 2003

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The local structure of the Fe-doped La1−xCaxMnO3 (x = 0.00–1.00) compounds has been investigated by means of Mössbauer spectroscopy. 57Fe Mössbauer spectra provide direct evidence of Jahn–Teller distortion in these manganites. On the basis of the Mössbauer results, the Jahn–Teller coupling was estimated. It is noteworthy that the Ca-concentration dependence of the Jahn–Teller coupling strength is very consistent with the magnetic phase diagram. Our results reveal that Mössbauer spectroscopy cannot only detect the local structural distortion, but also provide a technique to investigate the Jahn–Teller coupling of Fe-doped La1−xCaxMnO3 colossal magnetoresistive perovskites. © 2003 American Institute of Physics.
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76.80.+y Mössbauer effect; other γ-ray spectroscopy
71.70.Ej Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
61.66.Fn Inorganic compounds
75.47.Gk Colossal magnetoresistance
75.47.Lx Magnetic oxides

Room temperature formation of half-metallic Fe3O4 thin films for the application of spintronic devices

Jin Pyo Hong, Sung Bok Lee, Young Woo Jung, Jong Hyun Lee, Kap Soo Yoon, Ki Woong Kim, Chae Ok Kim, Chang Hyo Lee, and Myoung Hwa Jung

Appl. Phys. Lett. 83, 1590 (2003); http://dx.doi.org/10.1063/1.1604466 (3 pages) | Cited 30 times

Online Publication Date: 19 August 2003

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Half-metallic Fe3O4 films were prepared at room temperature using a rf sputtering system specially integrated with an external rf source. Primary emphasis was placed on obtaining a large amount of active oxygen radicals through an external electrode for efficient deposition. The insertion of an external electrode was found to be critical for room temperature growth of Fe3O4 thin films. The structural and electrical properties gave shift and broadening effects to the Verwey temperature at various powers. The magnetization could only be saturated when a 300 Oe field was applied along an easy axis of magnetization during growth. However, there was no sign of saturation up to 5 T under zero-field growth. © 2003 American Institute of Physics.
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72.25.-b Spin polarized transport
75.70.Ak Magnetic properties of monolayers and thin films
85.75.-d Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields
81.15.Cd Deposition by sputtering
68.55.-a Thin film structure and morphology
71.30.+h Metal-insulator transitions and other electronic transitions
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Nucleation of superconductivity in an Al mesoscopic disk with magnetic dot

D. S. Golubović, W. V. Pogosov, M. Morelle, and V. V. Moshchalkov

Appl. Phys. Lett. 83, 1593 (2003); http://dx.doi.org/10.1063/1.1604939 (3 pages) | Cited 20 times

Online Publication Date: 19 August 2003

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We have studied the nucleation of superconductivity in a mesoscopic Al disk with a Co/Pd magnetic dot placed on the top by measuring the normal/superconducting phase boundary Tc(B). The measurements have revealed a pronounced asymmetry in the phase boundary with respect to the direction of the applied magnetic field, indicating an enhancement of the critical field when an applied magnetic field is oriented parallel to the magnetization of the magnetic dot. The theoretical Tc(B) curve is in a good agreement with the experimental data. © 2003 American Institute of Physics.
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75.75.-c Magnetic properties of nanostructures
74.78.Na Mesoscopic and nanoscale systems
74.25.Ha Magnetic properties including vortex structures and related phenomena
74.25.Op Mixed states, critical fields, and surface sheaths
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
75.50.Cc Other ferromagnetic metals and alloys
75.50.Tt Fine-particle systems; nanocrystalline materials

Angular dependence of spin-transfer switching in a magnetic nanostructure

F. B. Mancoff, R. W. Dave, N. D. Rizzo, T. C. Eschrich, B. N. Engel, and S. Tehrani

Appl. Phys. Lett. 83, 1596 (2003); http://dx.doi.org/10.1063/1.1604936 (3 pages) | Cited 59 times

Online Publication Date: 19 August 2003

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We measured switching of a thin film nanomagnet driven by spin-polarized current in giant magnetoresistance spin valves as small as 50 nm×100 nm. Spin-transfer reversal is observed in both dc current and magnetic field sweeps, with a switching current of ∼5 mA, for example, for a bit with ∼900 Oe switching field in zero current. We studied the dependence of spin-transfer switching on the relative angle ϕ between the layer magnetizations by using a magnetic field to orient the magnetization of a bulk magnetic layer at an angle to a patterned layer held in place by shape anisotropy. The critical current is a minimum for collinear magnetizations and diverges as 1/∣cos ϕ∣ as ϕ increases to 90°, consistent with switching current calculations using the Slonczewski spin-transfer torque model. © 2003 American Institute of Physics.
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75.47.De Giant magnetoresistance
85.75.Mm Spin polarized resonant tunnel junctions
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
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