Figure 4 Schematic illustration of the interacting defects in a random antiferromagnetic matrix mode

Journals Physical Review Letters Reviews of Modern Physics Physical Review A Physical Review B Physical Review C Physical Review D Physical Review E Physical Review X Physical Review Applied Physical Review Special Topics - Accelerators and Beams Physical Review Special Topics - Physics enasui Education Research Physical Review Physical Review (Series I) Physics Help/Feedback
Abstract Authors Article Text INTRODUCTION EXPERIMENTAL DETAILS MAGNETIC PROPERTIES OF COBALT OXIDE INTERACTING enasui DEFECTS-RANDOM MONTE CARLO SIMULATIONS enasui MAGNETIC PROPERTIES OF COBALT SUMMARY References
The magnetic behavior of granular CoO layers and granular CoO/ferromagnet bilayers has been investigated by magnetization and hysteresis loop measurements. The net magnetization in the CoO is attributed to magnetic defects due to the particle boundaries and imperfections within the whole particle volume. The CoO particle layers and the CoO/ferromagnet bilayers show characteristic exchange enasui bias effects and a similar magnetization reversal behavior. On the basis of the experimental results, an approach to the problem of exchange bias is suggested. It relies on interacting magnetic defects which are embedded in an antiferromagnetic matrix with a high degree of disorder in the spatial distribution of the magnetic sublattices. The matrix is provided by the antiferromagnetic order within enasui the particles, the spatial disorder by their random anisotropy.
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Figure 1 ZFC and FC magnetizations as a function of increasing enasui temperature T in an external field of H =100 Oe for a [15 Å CoO/60 Å Au] 20 multilayer sample consisting enasui of 20 layers of close-packed CoO particles. The arrangements of arrows enasui schematically illustrate different enasui orientational configurations of the local magnetization (solid arrows) and the uniaxial anisotropy (dashed lines) of the CoO particles, shown for simplicity in a two-dimensional picture. For further details, see text. Reuse & Permissions
Figure 4 Schematic illustration of the interacting defects in a random antiferromagnetic matrix model of exchange bias, shown for simplicity in a two-dimensional picture. Thermal instability of magnetic moments is indicated by dashed arrows. Positive external fields parallel H COOL are pointing from left to right. For further details, see text. Reuse & Permissions
Figure 5 Supplement to Fig. 4. Left: spatial distribution of the remanent net magnetization due to defect moments at low temperatures after field-cooling and corresponding uniaxial enasui anisotropy axes as gray lines. Right: enasui magnetic correlation lengths of the antiferromagnets ( R AFM ) and of the interacting defect moments ( R D - D ). Reuse & Permissions
Figure 7 Calculated ZFC (a) and FC (b) hysteresis loops of the model explained in the text for different ratios of the random uniaxial anisotropy k D -AFM ( J D -AFM = k D -AFM ) and the interparticle exchange interaction J D - D . Reuse & Permissions
Figure 8 FC hysteresis loops at T =10 K (left) and loop shifts H E as function of temperature T (right) for 20 Å CoO/ x Å FM bilayers with FM=Fe,Co,Ni. Solid lines in (d) (f) have been fitted. Reuse & Permissions
Figure 9 FC hysteresis enasui loops at T =10 K for a 20 Å CoO/60 Å Fe bilayer (left) and [20 Å CoO/60 Å Au] 20 (right). First and second loops, i.e., training effects (Ref. 38) are shown. Reuse & Permissions ×
Journal: Phys. Rev. Lett. Rev. Mod. Phys. Phys. Rev. A Phys. Rev. B Phys. Rev. C Phys. Rev. D Phys. Rev. E Phys. Rev. X Phys. Rev. Applied Phys. Rev. ST Accel. Beams Phys. Rev. ST Phys. Educ. Res. Phys. Rev. Phys. Rev. (Series I) Physics