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Studies of the Magnetic Axis Switching in Magnetite

100%

Król G., Kusz J., Tarnawski Z., Kąkol Z., Tabiś W., Kozłowski A.

The influence of the external magnetic field on magnetic and crystallographic structure of magnetite was studied. We have confirmed, by means of vibrating sample magnetometer measurements, that external magnetic field can switch the easy magnetic axis to the new crystallographic direction. We have also proved by the direct observation of the crystalline structure that this phenomenon is strictly related to the crystallographic structure relaxation.

Studies of the Verwey Transition in Magnetite

84%

Tarnawski Z., Wiecheć A., Madej M., Nowak D., Owoc D., Król G., Kąkol Z., Kolwicz-Chodak L., KozŁowski A., Dawid T.

Acta Physica Polonica A

2004

vol. 106

issue 5

771-775

Studies of the specific heat and simultaneous AC magnetic susceptibility (ρ') and electric resistance of stoichiometric magnetite single crystal are presented. The temperature hysteresis of the Verwey transition is of 0.03 K found from the specific heat data confirming its first-order character. The continuous temporal change of ρ' at T_V can be switched off by an external magnetic field without affecting the transition. The electrical resistance decreases continuously with increasing temperature with a rapid change of slope at the point when the phase transition is completed. It was concluded that the magnetic degrees of freedom do not actively participate in the transition and that the entropy released at T_V may come from ordering electrons.

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2 Acta Physica Polonica A

1 2006

1 2004

2 Król G.

2 Kąkol Z.

2 Tarnawski Z.

1 Dawid T.

1 Kolwicz-Chodak L.

1 KozŁowski A.

1 Kozłowski A.

1 Kusz J.

1 Madej M.

1 Nowak D.

1 Owoc D.

1 Tabiś W.

1 Wiecheć A.

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Studies of the Magnetic Axis Switching in Magnetite

Studies of the Verwey Transition in Magnetite