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FMR Study of Co/Ti Bilayer Thin Films

100%

Erkovan M., Tokdemir Öztürk S., Taşkın Gazioğlu D., Topkaya R., Öztürk O.

Acta Physica Polonica A

2014

vol. 125

issue 2

673-676

We focused on the interaction between two ferromagnetic cobalt layers through a non-magnetic titanium layer. The magnetic properties of the structure were characterized by ferromagnetic resonance technique. The data were collected as a function of non-magnetic titanium layer thickness. Co/Ti multilayer (Ti(50 Å)/Co(45 Å)/Ti(2-40 Å)/Co(40 Å)/Ti(100 Å)) films were grown onto naturally oxidized p-type single crystal Si (100) substrate at UHV condition with magnetron sputtering system at room temperature. The thickness of Ti spacer layer ranges from 2 to 40 Å with 2 Å steps. We did not observe usual optic and acoustic modes; instead we had two broad overlapped peaks for the films ranged from 6 Å to 40 Å. One interesting result was the high anisotropic resonance field values for these films. Exchange coupling between ferromagnetic layers causes shift on resonance field values but these shifts in our samples were much larger than expected. This large anisotropic behavior is not clear at the moment. Our theoretical model was not able to determine a value for the exchange coupling parameter. One reason can be the close thickness values for Co sublayers. The other reason can be the Ti non-magnetic layer. If titanium did not grow layer by layer on cobalt, the cobalt ferromagnetic layers may behave as a single layer. As a result one cannot observe exchange interaction between ferromagnetic layers through non-magnetic spacer.

Manipulation of Exchange Coupling in Py/Co/Cr Multilayer Thin Films

73%

Aköz M., Parlak U., Şahin Y., Tavşan D., Tarcan E., Öztürk O., Tokdemir Öztürk S., Erkovan M.

The main issue addressed in present study is exchange coupling modification between ferromagnetic layers through non-magnetic spacer layers using extra ultra-thin ferromagnetic layers (Co). In order to achieve this goal, we prepared Cr(50 Å) / Py(20 Å) / Co(5 Å) / Cr(7, 10, 13 Å) / Co(5 Å) / Py (30 Å) / Cr(50Å) / Si using magnetron sputtering at UHV conditions and characterized by Ferromagnetic Resonance (FMR) technique. As the present study results were compared to our previous study on (Py/Cr), the exchange coupling energy was increased ten times with the cobalt thin layer

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2 Acta Physica Polonica A

1 2015

1 2014

2 Erkovan M.

2 Tokdemir Öztürk S.

2 Öztürk O.

1 Aköz M.

1 Parlak U.

1 Tarcan E.

1 Tavşan D.

1 Taşkın Gazioğlu D.

1 Topkaya R.

1 Şahin Y.

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FMR Study of Co/Ti Bilayer Thin Films

Manipulation of Exchange Coupling in Py/Co/Cr Multilayer Thin Films