Probing the interface magnetism in the FeMn/NiFe exchange bias system using magnetic second harmonic generation

Details Probing the interface magnetism in the FeMn/NiFe exchange bias system using magnetic second harmonic generation Probing the interface magnetism in the FeMn/NiFe exchange bias system using magnetic second harmonic generation

2002-11-26

arxiv.org/abs/cond-mat/0211580v1

Physics

Condensed Matter

Materials Science

submitted to Phys. Rev. Lett

Scientific paper

10.1209/epl/i2003-00598-7

Second harmonic generation magneto-optic Kerr effect (SHMOKE) experiments, sensitive to buried interfaces, were performed on a polycrystalline NiFe/FeMn bilayer in which areas with different exchange bias fields were prepared using 5 KeV He ion irradiation. Both reversible and irreversible uncompensated spins are found in the antiferromagnetic layer close to the interface with the ferromagnetic layer. The SHMOKE hysteresis loop shows the same exchange bias field as obtained from standard magnetometry. We demonstrate that the exchange bias effect is controlled by pinned uncompensated spins in the antiferromagnetic layer.

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