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NiO/Fe(001): Magnetic anisotropy, exchange bias, and interface structure
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10.1063/1.4811528
/content/aip/journal/jap/113/23/10.1063/1.4811528
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/23/10.1063/1.4811528

Figures

Image of FIG. 1.
FIG. 1.

(a) A typical LEED pattern for the 50ML NiO/Fe(001). Primary beam energy is equal to 90 eV. (b) Schematic representation of the samples. (c) Direction of the uniaxial magnetic anisotropy (UA) induced by the oblique deposition is marked by a double-sided arrow.

Image of FIG. 2.
FIG. 2.

Hysteresis loops measured for the main crystallographic directions for the as- deposited samples using polarized light (a) “EB−” system, (b) “EB+” system.

Image of FIG. 3.
FIG. 3.

Azimuthal dependence of the coercive field and the hysteresis loop shift measured before (open circles and open squares, respectively) and after field cooling (filled circles and filled squares, respectively). The error bars reflect the noise level during the measurements. The error bars for the “EB−” case are smaller than the data points. The direction of the magnetic field applied during FC is marked by an arrow.

Image of FIG. 4.
FIG. 4.

(a) Hysteresis loops for the sample EB+ measured with the s polarized light along the easiest anisotropy direction before (dotted line) and after field cooling performed at 230 °C, showing the exchange bias and training effects. The inset shows a magnification of the region marked by a rectangle (b) Decrease of the exchange bias field for the consecutive hysteresis loops measured after field cooling.

Image of FIG. 5.
FIG. 5.

Hysteresis loops for the sample “EB−” measured with the s polarized light along the easiest anisotropy direction before (dotted line) and after field cooling performed at 200 °C, 240 °C, and 255 °C showing the absence of exchange bias and gradual decrease of the coercivity.

Image of FIG. 6.
FIG. 6.

The longitudinal (M) and transversal (M) components of the magnetization measured for different azimuthal angles (φ) for the “EB−” system after FC.

Image of FIG. 7.
FIG. 7.

The reduced remanence (M/M) as a function of the azimuthal angle (φ) derived from both branches of the hysteresis loops (squares). The dotted line presents the cosine dependence of the remanence for the simple uniaxial anisotropy while the red (dark grey) solid line for the uniaxial anisotropy accompanied by a small unidirectional term presented separately as the green (light grey) solid circle.

Image of FIG. 8.
FIG. 8.

The reduced remanence (M/M) as a function of the azimuthal angle (φ) derived from both branches of the hysteresis loops measured before (black squares) and after (red circles) FC. The lines are guides to the eye.

Image of FIG. 9.
FIG. 9.

The longitudinal (M), transversal (M), and polar (M) components of the magnetization measured for different azimuthal angles (φ) for the ‘EB+’ system.

Image of FIG. 10.
FIG. 10.

CEMS spectra of the sample “1_EB−” (a) and “2_EB−” (b) with the result of the best fit. The spectral components: M, O, O and O are offset in the y-axis for clarity.

Image of FIG. 11.
FIG. 11.

CEMS spectra of the ‘EB+’ sample with the result of the best fit. The spectral components: M, O, O, and O are offset in the y-axis for clarity.

Image of FIG. 12.
FIG. 12.

The schematic representation of the “EB−” and “EB+” samples, based on the results of the Mössbauer measurements.

Tables

Generic image for table
Table I.

Hyperfine parameters derived from the numerical fits of CEMS spectra for “1_EB−,” “2_EB−,” and “EB+” samples. Numbers in parentheses indicate the last digit uncertainty resulting from the least squares fit analysis.

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/content/aip/journal/jap/113/23/10.1063/1.4811528
2013-06-21
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: NiO/Fe(001): Magnetic anisotropy, exchange bias, and interface structure
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/23/10.1063/1.4811528
10.1063/1.4811528
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