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Direct manipulation of the uncompensated antiferromagnetic spins in exchange coupled system by GeV ion irradiation
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View: Figures


Image of FIG. 1.
FIG. 1.

SQUID magnetization hysteresis loops for the [Co/CoO/Au]16 ML of (a) as-deposited specimen and for different fluences of (b–c) Au ion irradiation and (d), (e) U ion irradiation. The measurements are done at room temperature and at 10 K after cooling down at H FC. The differently shaded arrows (vertical and rotating arrows) indicate the magnetization reversal mechanism along the respective branches of the loops. The green circles indicate the fields of neutron measurements shown later. (f) TRIM simulations on Co-Au target showing the electronic energy loss as compared to the nuclear energy loss with respect to the energies of Au and U ions. The ion energies used are indicated by lines. (g), (h) Plots of H eb (squares) and H C (circles) as a function of irradiation fluence of Au and U ions respectively during the first and second field cycles.

Image of FIG. 2.
FIG. 2.

XTEM micrographs of [Co/CoO/Au]16 ML for (a) as-deposited and (b) U 1 × 1013 ion-irradiated sample.

Image of FIG. 3.
FIG. 3.

Specular reflectivity patterns (solid symbols) along with their fits (open symbols) at two different applied fields, for the ML irradiated with U 1 × 1013 ions. The measurements were done during the first field cycle at field indicated in Fig. 1(e) after cooling the sample in field down to 10 K. , where are the incident and exit angles. The SA signal is also plotted in the bottom panel for comparison with the as-deposited specimen. The right hand panels show the measured NSF and SF intensity maps along with DWBA simulated patterns at around the coercive field for the SF channel.

Image of FIG. 4.
FIG. 4.

(a) Comparison of the measured Co K-edge normalized XANES spectra of all the MLs along with their fits and compared with the calculated spectra. Also included are the reference spectra of CoO and Co metal. (b) L-edge XAS spectra for the U 1 × 1013 ions irradiated samples. (c) The intensity ratio (L-edge) and the AF-FM ratio (K-edge) for the same ML with fluence.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Direct manipulation of the uncompensated antiferromagnetic spins in exchange coupled system by GeV ion irradiation