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Experiments on Interlayer Exchange Coupling

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Grünberg P., Schaefer M., Takanashi K., Rücker U., Nassar J., Mertig I.

Acta Physica Polonica A

1997

vol. 91

issue 1

7-14

The results of various experiments on interlayer exchange coupling will be reviewed. After a general discussion of the theoretical understanding we deal first with 90°-type coupling and show that two mechanisms proposed by Slonczewski can explain our measured data. We furthermore study the coupling of Fe films across Cu_{x}Au_{1-x} alloys. For the composition with x=0.5, the coupling strength strongly increases with annealing. We believe that this is due to an order-disorder structural transformation in the Cu_{x}Au_{1-x} alloy. Finally, we present results on epitaxially grown bilayers Fe/EuS(100) and trilayers Fe/EuS/Fe(100). In the latter at room temperature we observe a strong decrease in the coupling strength as a function of the interlayer thickness, with a characteristic length of about 0.1 nm. At low temperatures in the bilayer we find an antiferromagnetic coupling between Fe and the adjacent ferromagnetic EuS.

Structural and Magnetic Properties of MBE Grown (Fe/Pt) (111) Multilayers

68%

Marynowska A., Dynowska E., Lewińska S., Seki T., Takanashi K., Kanak J., Pietruczik A., Aleszkiewicz P., Wawro A., Ślawska-Waniewska A., Baczewski L.

Acta Physica Polonica A

2016

vol. 130

issue 6

1363-1370

Series of Al₂O₃(0001)/Pt/(Fe/Pt)ₙ/Pt multilayers with variable number of bilayers n and thicknesses of individual layers were grown using molecular beam epitaxy to investigate influence of buffer layer structure, number of bilayers, and individual layer thickness on their structural and magnetic properties. Both columnar and monocrystalline 10 nm Pt (111) buffer layers were used in the experiment. Structure of Pt buffer layer determined the roughness of Fe/Pt interfaces and consequently magnetic properties of the multilayers. When multilayers were deposited on columnar Pt buffer layer, we observed increase of Fe/Pt interfaces roughness with increasing number of bilayers to values exceeding the nominal Fe/Pt bilayer thickness in the upper part of the sample volume, which resulted in the increment of coercivity in the sample with n=15 determined from hysteresis loops measured for perpendicular orientation of magnetic field. When Fe/Pt multilayers were deposited on monocrystalline Pt buffer layer, Fe/Pt interfaces were smooth regardless the number of bilayers. All samples, despite of the quality of buffer layer, number of bilayers, and individual layer thickness revealed easy magnetisation axis oriented in the sample plane.

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2 Acta Physica Polonica A

1 2016

1 1997

2 Takanashi K.

1 Aleszkiewicz P.

1 Baczewski L.

1 Dynowska E.

1 Grünberg P.

1 Kanak J.

1 Lewińska S.

1 Marynowska A.

1 Mertig I.

1 Nassar J.

1 Pietruczik A.

1 Rücker U.

1 Schaefer M.

1 Seki T.

1 Wawro A.

1 Ślawska-Waniewska A.

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Experiments on Interlayer Exchange Coupling

Structural and Magnetic Properties of MBE Grown (Fe/Pt) (111) Multilayers