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Density of States and Indirect Exchange in Metallic Systems

100%

Hernando A., Rojo J., Gómez Sal J., Barandiarán J.

Acta Physica Polonica A

1996

vol. 90

issue 6

1227-1234

The relation between the density of states at the Fermi level and the sign of the indirect coupling in metallic systems is revisited in the framework of a simple model recently outlined by the authors. It is shown that high density of states tends to favor ferromagnetic structures. Some examples which support this idea are indicated. Finally we develop a phenomenological explanation for the antiferromagnetic → ferromagnetic transition induced by heating equiatomic FeRh. The transition is analysed in terms of the increase in the density of states produced by the giant volume expansion associated with the ferromagnetic phase.

Permanent Magnetism in Thiol Capped Nanoparticles Gold and ZnO

64%

Crespo P., García M., Fernández-Pinel E., de la Venta J., Merino J., Quesada A., Hernando A., Fernández A., Penadés S.

Acta Physica Polonica A

2008

vol. 113

issue 1

515-520

In spite of the diamagnetic behavior exhibited by bulk ZnO and Au, a ferromagnetic-like behavior is induced in nanoparticles of both systems by appropriate surface functionalization. By capping with thiol derivatized molecules, magnetic hysteresis is observed even at room temperature, whereas the magnetization has a very little temperature dependence. Capping induces an alteration of their electronic configuration that depends on the capping molecule, as evidenced by X-ray absorption spectroscopy, that strongly affects their magnetic properties.

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2 Acta Physica Polonica A

1 2008

1 1996

2 Hernando A.

1 Barandiarán J.

1 Crespo P.

1 Fernández A.

1 Fernández-Pinel E.

1 García M.

1 Gómez Sal J.

1 Merino J.

1 Penadés S.

1 Quesada A.

1 Rojo J.

1 de la Venta J.

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Density of States and Indirect Exchange in Metallic Systems

Permanent Magnetism in Thiol Capped Nanoparticles Gold and ZnO