Invited article: Vector and Bragg Magneto-optical Kerr effect for the analysis of nanostructured magnetic arrays

We have studied the structural, magnetic, and electronic properties of Co-implanted ZnO͑0001͒ films grown on Al 2 O 3 ͑1120͒ substrates for different implantation doses and over a wide temperature range. Strong room temperature ferromagnetism is observed with magnetic parameters depending on the cobalt implantation dose. A detailed analysis of the structural and magnetic properties indicates that there are two magnetic phases in Co-implanted ZnO films. One is a ferromagnetic phase due to the formation of long range ferromagnetic ordering between implanted magnetic cobalt ions in the ZnO layer and the second one is a superparamagnetic phase, which occurs due to the formation of metallic cobalt clusters in the Al 2 O 3 substrate. Using x-ray resonant magnetic scattering, the element specific magnetization of cobalt, oxygen, and Zn was investigated. Magnetic dichroism was observed at the Co L 2,3 edges as well as at the O K edge. In addition, the anomalous Hall effect is also observed, supporting the intrinsic nature of ferromagnetism in Co-implanted ZnO films.

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“…[31][32][33] Figure 4 shows the hysteresis loops of Coimplanted ZnO films which were recorded at room temperature. The MOKE data in Fig.…”

Section: Room Temperature Magnetization Measurementsmentioning

confidence: 99%

Dose dependence of ferromagnetism in Co-implanted ZnO

Akdoğan

Zabel

Nefedov

et al. 2009

Journal of Applied Physics

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“…Diffracted MOKE magnetization loops, on the other hand, are proportional to the magnetic form factor f n m observed at the nth diffraction order of the scattered beam and can therefore yield information about the internal magnetization distribution of patterned elements in periodic arrays. [17][18][19][20][21][22][23][24] Furthermore, they can also be used to investigate and compare patterns from different arrangements of the same elements as is demonstrated in this study.…”

Section: Introductionmentioning

confidence: 97%

Magnetic structure and diffracted magneto-optics of patterned amorphous multilayers

et al. 2010

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We present magneto-optical Kerr effect measurements of patterned arrays of Co 68 Fe 24 Zr 8 / Al 2 O 3 amorphous multilayers. The multilayers were patterned in two dimensions into two different arrangements of circular and ellipsoidal islands. Magnetization loops were recorded in a longitudinal geometry using both the specularly reflected beam as well as diffracted beams scattered off the patterned films. The magnetization of the patterned structures is significantly different from the magnetization of a continuous multilayer owing to the lateral confinement of the pattern and the introduction of additional dipolar coupling between the layers at the edges of the islands. By investigating the magnetic response at the different diffraction orders from the two different configurations of islands we are able to observe the magnetization at different length scales and determine the magnetic response of the circular and ellipsoidal islands individually.

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“…Only magnetic transmission X-ray microscopy (MTXM), Kerr microscopy (KM), and Bragg magneto--optical Kerr effect (Bragg-MOKE) remains. We have chosen Bragg-MOKE, which is, however, not an imaging technique in real space, but in the Fourier space [17][18][19]. With Bragg-MOKE the magnetic hystereses for different orders of interference are determined, which yields the Fourier components of the magnetization distribution within the bars, i.e.…”

Section: Magnetization Reversalmentioning

confidence: 99%

Order and Frustration in Artificial Magnetic Patterns

et al. 2009

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Artificial magnetic dipole arrays arranged on a square lattice exhibit a fascinating variety and complexity of configurations. Among the 16 possible configurations, six fulfill the spin ice rule of two dipoles pointing into a vertex and two point out. We present experimental realizations of magnetic dipole arrays and discuss the remanent state as well as the magnetization reversal in an external field.

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Invited article: Vector and Bragg Magneto-optical Kerr effect for the analysis of nanostructured magnetic arrays

Cited by 45 publications

References 71 publications

Dose dependence of ferromagnetism in Co-implanted ZnO

Dose dependence of ferromagnetism in Co-implanted ZnO

Magnetic structure and diffracted magneto-optics of patterned amorphous multilayers

Order and Frustration in Artificial Magnetic Patterns

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