TITLE

Enhancement of the magnetic field sensitivity in Al2O3 encapsulated NiFe films with anisotropic magnetoresistance

AUTHOR(S)
Ding, Lei; Teng, Jiao; Zhan, Qian; Feng, Chun; Li, Ming-hua; Han, Gang; Wang, Li-jin; Yu, Guang-hua; Wang, Shu-yun
PUB. DATE
April 2009
SOURCE
Applied Physics Letters;4/20/2009, Vol. 94 Issue 16, p162506
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The anisotropic magnetoresistance value (ΔR/R) and magnetic field sensitivity (Sv) of NiFe films can be remarkably enhanced by using Al2O3 encapsulation, and the Sv is comparable to that of a spin valve. For an ultrathin NiFe film with the structure of Ta/Al2O3/NiFe/Al2O3/Ta, the Al2O3 layers suppress the formation of the magnetic dead layers and the interdiffusions between the NiFe layer and Ta layers, and decrease the current shunting of the Ta layers. More importantly, the flatter Al2O3/NiFe and NiFe/Al2O3 interfaces can significantly enhance the specular reflection of conduction electrons and lead to a higher ΔR/R. In addition, the formations of the NiFe (111) texture and the columnar grains by annealing can also increase the ΔR/R.
ACCESSION #
38225268

 

Related Articles

  • Magnetic anisotropy in giant magnetoresistive CoAg granular films (abstract). Gester, M.; Henry, Y. // Journal of Applied Physics;4/17/1997, Vol. 81 Issue 8, p5207 

    Presents an abstract of the paper `Magnetic Anisotropy in Giant Magnetoresistive CoAg Granular Films,' presented by M. Gester, Y. Henry, et al, at the American Institute of Physics' 1997 Conference on Magnetism and Magnetic Materials.

  • Pseudo-spin-valve with L10 (111)-oriented FePt fixed layer. Zha, C. L.; Bonetti, S.; Persson, J.; Zhou, Yan; Åkerman, Johan // Journal of Applied Physics;Apr2009, Vol. 105 Issue 7, p07E910 

    Recently we proposed a spin torque oscillator where the fixed layer has its magnetization easy-axis tilted with respect to the film plane to simultaneously achieve zero-field operation and high output power [Y. Zhou, C. L. Zha, S. Bonetti, J. Persson, and J. Ã…kerman, Appl. Phys. Lett. 92,...

  • Direct observation of magnetization reversal and low field magnetoresistance of epitaxial La0.7Sr0.3MnO3/SrTiO3 (001) thin films at room temperature. Fadil, D.; Wu, S.; Perna, P.; Renault, B.; Saïb, M.; Lebargy, S.; Gasnier, J.; Guillet, B.; Routoure, J.-M.; Flament, S.; Méchin, L. // Journal of Applied Physics;Jul2012, Vol. 112 Issue 1, p013906 

    We have observed the in-plane magnetic domain arrangement during magnetization reversal in a 40 nm thick La0.7Sr0.3MnO3/SrTiO3 (001) thin film patterned into 500 μm long microbridges of width 50 or 100 μm. Magneto-optical Kerr effect microscopy was used at room temperature and magnetic...

  • Thickness-dependent structural and magnetic properties of BiFeO3 films prepared by metal organic decomposition method. Huang, Fengzhen; Lu, Xiaomei; Lin, Weiwei; Kan, Yi; Zhang, Junting; Chen, Qingdong; Wang, Zhe; Li, Liben; Zhu, Jinsong // Applied Physics Letters;11/29/2010, Vol. 97 Issue 22, p222901 

    Perovskite BiFeO3 films with various thicknesses were prepared on Pt/Ti/SiO2/Si substrates by metal organic decomposition method. It was found that, with the film thickness increasing from 35 to 120 nm, the grain and ferroelectric domain size slightly increased, while the saturation...

  • Giant magnetoresistance and superparamagnetic grains in Co-Ag granular films. Honda, S.; Nawate, M. // Journal of Applied Physics;7/15/1997, Vol. 82 Issue 2, p764 

    Discusses the magnetic and galvanomagnetic properties of Co-Ag films in relation to the film structure. Peculiar magnetoresistance; Giant magnetoresistance; Extraordinary Hall effect.

  • Oxygen-deficiency-activated phase transition in a long-aged La[sub 0.8]Ca[sub 0.2]MnO[sub 3] film. Prokhorov, V. G.; Kaminsky, G. G.; Komashko, V. A.; Lee, Y. P.; Park, J. S.; Ri, H. C. // Applied Physics Letters;4/15/2002, Vol. 80 Issue 15, p2707 

    The magnetic and transport properties of as-deposited and long-aged La[sub 0.8]Ca[sub 0.2]MnO[sub 3-δ] films have been investigated in a wide temperature range. The x-ray diffraction data have shown separation of the film into two crystalline phases of the cubic and rhombohedral symmetry with...

  • Giant magnetoresistive memory effect in Nd[sub 0.7]Sr[sub 0.3]MnO[sub z] films. Xiong, G.C.; Li, Q. // Applied Physics Letters;11/13/1995, Vol. 67 Issue 20, p3031 

    Details a magnetoresistive memory phenomenon in the Nd[sub 0.7]Sr[sub 0.3]MnO[sub z] thin films. Dependence of the resistivity of the film on the magnetic history; Preparation and characterization of the films; Measurements showing good epitaxial structure on as-deposited films.

  • Temperature dependence of the resistivity and tunneling magnetoresistance of sputtered FeHf(Si)O... Strijkers, G.J.; Swagten, H.J.M.; Rulkens, B.; Bitter, R.H.J.N.; de Jonge, W.J.M.; Bloemen, P.J.H.; Schep, K.M. // Journal of Applied Physics;9/1/1998, Vol. 84 Issue 5, p2749 

    Focuses on the tunneling resistivity and magnetoresistance of reactive sputter deposited iron compound thin granular films. Composition of the films; Correlation between magnetoresistance and temperature; Description of a model for tunneling magnetoresistance which takes spin-flip scattering...

  • Observation of the evolution of anisotropic magnetoresistance in thin magnetic films. Zhao, H.W.; Lu, M. // Journal of Applied Physics;7/1/1997, Vol. 82 Issue 1, p485 

    Reports that the evolutionary process of the anisotropic magnetoresistance from the positive to the negative by changing the field direction was observed in magnetic thin films of Ni-Co, Ni-Fe and Co. Occurrence of various peculiar magnetoresistance-field curves.

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics