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Condensed Matter Seminars

ics Condensed Matter
Wednesday, March 18, 2015
3:30 PM
Physics Building, Room 204
Note special date.
Note special time.
Note special room.
Linqiang Luo [Host: Stu Wolf]
University of Virginia
"Magneto-transport and domain wall scattering in the epitaxial L10 MnAl thin films"

L10 MnAl films with perpendicular magnetic anisotropy were synthesized by a bias target ion beam deposition technique. XRD results showed that MnAl thin film was expitaxially grew on Cr buffered MgO(001) substrate with tetragonal distortion c/a ration ~1.3. A Cr seeding layer optimized the magnetic anisotropy and saturation magnetization. The magneto-transport(MR) properties of MnAl were investigated by using a Hall bar structure. From 320K to 175K, the MR curve peaked exactly at coercivity field and was suggested to be a manifestation of domain wall(DW) scattering. Maze-like strip domains were observed by MFM after demagnetization. The difference of in-plane and out-of-plane resistance showed evidence of domain effect. The quantitative analysis for domain density in comparison with that of resistance implied the contribution of domain wall scattering. Below 150K, the effect of DW scattering on the MR was very small compared to the Lorentz MR.

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