(Color online) Magnetization curves of a 250-nm-thick MnAs film at room temperature. The applied magnetic field directions are along (in-plane magnetic easy axis), (in-plane magnetic hard axis), and (normal to the plane). The inset shows a detailed magnetization curve in a magnetic field along the easy axis.
Magnetic field dependence of Hall resistivity. Current flows along .
(Color online) AFM and MFM images of the remanent state after magnetization along the in-plane easy axis . The height scale of the AFM images ranges from 0 (dark) to 30 (light) nm. A schematic magnetic domain structure of the ladder-type structure is also shown. The magnetic easy axis is along and the magnetic hard axis is along MnAs .
In-plane magnetoresistance values for different current directions and various magnetic field directions. The upper figures show the case of (perpendicular to the grooves) and the lower figures show the case of (parallel to the grooves). Applied magnetic field directions are along (a, d) (in-plane magnetic easy axis); (b, e) (in-plane magnetic hard axis); and (c, f) (normal to the plane). The MR ratio is defined as , where is the zero-field resistance and is the resistance under the magnetic field.
(Color online) Detailed in-plane magnetoresistance curves for applied magnetic field directions along (in-plane magnetic easy axis). The current direction is (a) (perpendicular to the grooves) and (b) (parallel to the grooves). The linear negative MR components are subtracted in order to clarify the change of low-field MR. The insets show the raw MR data.
Magnetic domain structures observed using a Kerr microscope. The magnetic field is applied along . Schematic domain structures of the ladder-type domains are also shown beside each picture.
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