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30 Dec 2002

Volume 81, Issue 27, pp. 5099-5257

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Improved corrosion resistance of IrMn by Cr and Ru additions

M. J. Carey, A. Kellock, L. Baril, J. R. Childress, T. Le, T. Thompson, and B. A. Gurney

Appl. Phys. Lett. 81, 5198 (2002); http://dx.doi.org/10.1063/1.1526910 (3 pages) | Cited 7 times

Online Publication Date: 19 December 2002

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The magnetic and corrosion properties of Ir16Mn84 with Ru and Cr additions have been studied. Spin valves with Ir16Mn84–Ru have slightly lower Hex and Tb than when pure Ir16Mn84 is used. The corrosion properties improve, Hex and Tb improve with 3 vol % Cr, but drop considerably with more Cr additions, losing 21% of the pure IrMn value by 12 vol % Cr. The corrosion current and potential are Ic = 8 μA/cm2 and E0 = −580 mV respectively, for Ir16Mn84 with 12 vol % Cr. This represents a significant improvement over pure Ir16Mn84, which has Ic = 100 μA/cm2 and E0 = −1300 mV. When Ru is used as the additive, Ic and E0 are 10 μA/cm2 and −100 mV, respectively, for 9 vol %. Cr is the superior additive, especially in small concentrations where it shows a significant decrease in the Ic without degrading the magnetic properties. © 2002 American Institute of Physics.
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85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
75.47.De Giant magnetoresistance
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Ee Antiferromagnetics

Magnetic and martensitic phase transitions in ferromagnetic Ni–Ga–Fe shape memory alloys

K. Oikawa, T. Ota, T. Ohmori, Y. Tanaka, H. Morito, A. Fujita, R. Kainuma, K. Fukamichi, and K. Ishida

Appl. Phys. Lett. 81, 5201 (2002); http://dx.doi.org/10.1063/1.1532105 (3 pages) | Cited 150 times

Online Publication Date: 19 December 2002

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Ferromagnetic shape memory alloys with a body-centered-cubic ordered structure in a Ni–Ga–Fe system have been developed. The alloys with the composition range of Ni 27 at. % Ga (20–22 at. %)Fe exhibit a thermoelastic martensitic transformation from a B2 and/or an L21 parent to a martensite phase, with a seven-layer modulated (14M) and a five-layer modulated (10M) structure, in the ferromagnetic state. The parent phase transforms from the B2 to the L21 structure at about 970 K during cooling, and the degree of the L21 order in the parent phase is increased by annealing at 773 K, resulting in the increase of both the martensite starting and the Curie temperatures. The ductility of these alloys is improved by introducing of a small amount of a γ-phase solid solution. Consequently, we can conclude that the present alloys are promising for ferromagnetic shape memory alloys. © 2002 American Institute of Physics.
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81.30.Kf Martensitic transformations
64.70.K- Solid-solid transitions
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Bb Fe and its alloys
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