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18 Feb 2008

Volume 92, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 92, 073101 (2008); http://dx.doi.org/10.1063/1.2840574 (3 pages)

N. W. Gong, M. Y. Lu, C. Y. Wang, Y. Chen, and L. J. Chen
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360° domain wall generation in the soft layer of magnetic tunnel junctions

M. Hehn, D. Lacour, F. Montaigne, J. Briones, R. Belkhou, S. El Moussaoui, F. Maccherozzi, and N. Rougemaille

Appl. Phys. Lett. 92, 072501 (2008); http://dx.doi.org/10.1063/1.2838455 (3 pages) | Cited 3 times

Online Publication Date: 21 February 2008

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High spatial resolution x-ray photoemission electron microscopy technique has been used to study the influence of the dipolar coupling taking place between the NiFe and the Co ferromagnetic electrodes of micron sized, elliptical shaped magnetic tunnel junctions. The chemical selectivity of this technique allows us to observe independently the magnetic domain structure in each ferromagnetic electrode. The combination of this powerful imaging technique with micromagnetic simulations allows us to evidence that a 360° domain wall can be stabilized in the NiFe soft layer. In this letter, we discuss the origin and the formation conditions of those 360° domain walls evidenced experimentally and numerically.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ch Domain walls and domain structure
75.40.Mg Numerical simulation studies
82.80.Pv Electron spectroscopy (X-ray photoelectron (XPS), Auger electron spectroscopy (AES), etc.)

Epitaxial Ni–Mn–Ga films deposited on SrTiO3 and evidence of magnetically induced reorientation of martensitic variants at room temperature

O. Heczko, M. Thomas, J. Buschbeck, L. Schultz, and S. Fähler

Appl. Phys. Lett. 92, 072502 (2008); http://dx.doi.org/10.1063/1.2883961 (3 pages) | Cited 18 times

Online Publication Date: 21 February 2008

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Epitaxial Ni–Mn–Ga films were grown on SrTiO3 by sputter deposition. The films deposited at 673 K are ferromagnetic and martensitic at room temperature. Pole figure measurements indicate that the twinned orthorhombic martensite microstructure of the film has a lower symmetry compared to bulk. Magnetically induced reorientation or magnetic shape memory effect is indicated by magnetization curve measurements. Though the overall extension of the film is constrained by a rigid substrate, the reorientation is possible due to the additional degree of freedom in the orthorhombic phase.
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75.70.Ak Magnetic properties of monolayers and thin films
75.50.Dd Nonmetallic ferromagnetic materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.15.Cd Deposition by sputtering
81.30.Kf Martensitic transformations

Over 40% transverse Kerr effect from Ni80Fe20

D. A. Allwood, P. R. Seem, S. Basu, P. W. Fry, U. J. Gibson, and R. P. Cowburn

Appl. Phys. Lett. 92, 072503 (2008); http://dx.doi.org/10.1063/1.2884332 (3 pages) | Cited 3 times

Online Publication Date: 21 February 2008

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We show how mixed s- and p-polarized light incident on a ferromagnetic surface yields large transverse magneto-optical Kerr effect (MOKE) signals. Fractional MOKE signals of over 40% could be achieved from transverse magnetization changes in 35 nm thick Ni80Fe20, an increase of over two orders of magnitude compared with the standard MOKE configuration. Transverse MOKE signals from patterned structures were also improved by an order of magnitude. Calculations of the magneto-optical interaction show how changing the incident polarization controls the Kerr rotation and reflected beam intensity for opposite magnetization orientations.
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78.20.Ls Magneto-optical effects
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Bb Fe and its alloys

Giant room-temperature magnetocaloric effect in Mn1−xCrxAs

N. K. Sun, W. B. Cui, D. Li, D. Y. Geng, F. Yang, and Z. D. Zhang

Appl. Phys. Lett. 92, 072504 (2008); http://dx.doi.org/10.1063/1.2884524 (3 pages) | Cited 17 times

Online Publication Date: 21 February 2008

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A giant magnetocaloric effect was observed at room temperature in Mn1−xCrxAs compounds with x = 0.006 and 0.01. The Cr dopant reduces (or even eliminates) the large thermal hysteresis of MnAs, while it lowers the first-order transition temperature from 313 K for MnAs to 265 K for Mn0.99Cr0.01As. Near the Curie temperature, a magnetic field induces a first-order phase transition from a ferromagnetic hexagonal phase to a paramagnetic orthorhombic phase, leading to a maximum value of ΔSM of 20.2 J/kg K at 267 K for a 5 T field change for Mn0.99Cr0.01As. The study on the Mn1−xCrxAs system may open an important field in searching proper materials for room-temperature magnetic refrigeration.
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75.30.Sg Magnetocaloric effect, magnetic cooling
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Cc Other ferromagnetic metals and alloys
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