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Exchange Coupling and Exchange Bias in FM/AFM Bilayers for a Fully Compensated AFM Interface

100%

Skubic B., Hellsvik J., Nordström L., Eriksson O.

Acta Physica Polonica A

2009

vol. 115

issue 1

25-29

We address the interlayer coupling in a ferromagnet/antiferromagnet bilayer where the interface of the antiferromagnet is fully compensated. We discuss the role of different types of exchange interaction for the interlayer coupling and exchange bias. We propose two types of corrections to the ideal Heisenberg Hamiltonian which may explain exchange bias. The first is a correction for the angular dependence of the exchange interactions and the second a correction due to magnetostriction and interface imperfections. The first correction contributes to an anisotropy at the interface and favors either parallel or perpendicular coupling across the interface. The second correction contributes to the exchange bias. Our analysis is based on atomic spin dynamics simulations, and our results show that small corrections to the ideal Heisenberg Hamiltonian may have macroscopic consequences in systems with frustrated interatomic interactions.

Pressure Effect on Magnetic Properties of UGa_{3}

76%

Grechnev G., Delin A., Eriksson O., Johansson B., Panfilov A., Svechkarev I., Kaczorowski D.

Acta Physica Polonica A

1997

vol. 92

issue 2

331-333

The magnetic susceptibility, χ, of the itinerant antiferromagnetic compound UGa_{3} was studied under pressure up to 2 kbar in the temperature range 64-300 K. The measured pressure derivative of the Néel temperature is found to be dT_{N}/dP=-1.1 K/kbar. In order to analyze the experimental magnetovolume effect values, d lnχ/d lnV, the volume dependent electronic structure of UGa_{3} has been calculated ab initio in a paramagnetic phase by employing a relativistic full-potential linear muffin tin orbital method and including an external magnetic field self-consistently. The calculations revealed a predominance of itinerant uranium f-states at the Fermi energy, as well as a large orbital contribution to χ.

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2 Acta Physica Polonica A

1 2009

1 1997

2 Eriksson O.

1 Delin A.

1 Grechnev G.

1 Hellsvik J.

1 Johansson B.

1 Kaczorowski D.

1 Nordström L.

1 Panfilov A.

1 Skubic B.

1 Svechkarev I.

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Exchange Coupling and Exchange Bias in FM/AFM Bilayers for a Fully Compensated AFM Interface

Pressure Effect on Magnetic Properties of UGa_{3}