Artículo de revista
Enhanced positive and negative exchange bias in FeF2/Ni with dusted interfaces
Fecha
2020Registro en:
Applied Physics Letters Volumen: 117 Número: 9 Aug 31, 2020
10.1063/5.0021267
Autor
Montoya, I.
Torres Sánchez, Felipe
Redondo, C.
Kiwi Tichauer, Miguel
Schuller, Iván K.
Morales R., Mónica
Institución
Resumen
An enhanced exchange bias was found in FeF2/Ni interfaces by inserting dusting of Pd and Cu atoms. We have used an ultrathin wedge to investigate systematically the effect of a discontinuous nonmagnetic spacer between the antiferromagnetic and ferromagnetic layers. Negative and positive exchange biases are symmetric and maximized for less than two angstroms of the nonmagnetic layer. Moreover, the dusting reduces the field cooling threshold to switch between the negative and the positive exchange bias. This finding demonstrates that nonmagnetic dusted layers can improve the interfacial exchange energy density in antiferromagnetic/ferromagnetic heterostructures and modify the bulk antiferromagnetic domain structure. Other dusting materials such as Ag, Ti, V, and SiO2 showed no enhancement in FeF2/Ni bilayers, which indicates the atomic sensitivity of this effect.