Time-resolved hard X-ray magnetic microprobe at SPring-8

An instrument for hard X-ray magnetometry with spatial and time resolutions of 400-ps and sub-2- mu m was developed at BL39XU, SPring-8. The technique is based on X-ray magnetic circular dichroism measurements combined with KB focusing mirrors and a fast current source, which generates a pulsed magn...

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Bibliographic Details
Published in:Proceedings of the 10th International Conference 2009-10, Vol.1234, p.129-132
Main Authors: Suzuki, Motohiro, Kawamura, Naomi, Osawa, Hitoshi, Takagaki, Masafumi, Ono, Kanta, Taniuchi, Toshiaki, Isogami, Shinji, Tsunoda, Masakiyo
Format: Article
Language:English
Subjects:
Current sources
Devices
Dichroism
Focusing
Intermetallics
Iron compounds
Jitter
Magnesium oxide
Magnetic fields
Magnetization
Nanocomposites
Nanomaterials
Nanostructure
Nickel base alloys
Nickel compounds
Reversing
Tunnel junctions
X-rays
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Summary:An instrument for hard X-ray magnetometry with spatial and time resolutions of 400-ps and sub-2- mu m was developed at BL39XU, SPring-8. The technique is based on X-ray magnetic circular dichroism measurements combined with KB focusing mirrors and a fast current source, which generates a pulsed magnetic field of 400-ps duration that is synchronized with the X-ray pulses provided from the storage ring in the 203-bunch operation (42 MHz) with a jitter of 50 ps. By fully using the bulk-sensitivity and element-specificity of hard X-ray dichroism, we have demonstrated that the magnetization reversing process in the nanosecond time scale of the free NiFe and pinned CoFeB/CoFe layers were separated in a 10- mu n dot sample with a NiFe/MgO/CoFeB/CoFe/MgO structure mimicking a magnetic tunnel junction device.
ISSN:0094-243X