Shifted loops and coercivity from field-imprinted high-energy barriers in ferritin and ferrihydrite nanoparticles

Silva, N. J. O. ; Amaral,V. S. ; Urtizberea,A. ; Bustamante,R. ; Millán,A. (Universidad de Zaragoza) ; Palacio,F. ; Kampert,E. ; Zeitler,U. ; De Brion,S. ; Iglesias,A. A. ; Labarta,A.

Resumen: We show that the coercive field in ferritin and ferrihydrite depends on the maximum magnetic field in a hysteresis loop and that coercivity and loop shifts depend both on the maximum and cooling fields. In the case of ferritin, we show that the time dependence of the magnetization also depends on the maximum and previous cooling fields. This behavior is associated to changes in the intraparticle energy barriers imprinted by these fields. Accordingly, the dependence of the coercive and loop-shift fields with the maximum field in ferritin and ferrihydrite can be described within the frame of a uniform-rotation model considering a dependence of the energy barrier with the maximum and the cooling fields.

Idioma: Inglés

DOI: 10.1103/PhysRevB.84.104427

Año: 2011

Publicado en: Physical review. B, Condensed matter and materials physics 84, 10 (2011), 104427 [7 pp]
ISSN: 1098-0121

Factor impacto JCR: 3.691 (2011)

Categ. JCR: PHYSICS, CONDENSED MATTER rank: 13 / 68 = 0.191 (2011) - Q1 - T1

Financiación: info:eu-repo/grantAgreement/ES/MICINN/CSD2006-00012
Financiación: info:eu-repo/grantAgreement/ES/MICINN/CSD2007-00010
Financiación: info:eu-repo/grantAgreement/ES/MICINN/MAT2007-61621
Financiación: info:eu-repo/grantAgreement/ES/MICINN/MAT2009-08667

Tipo y forma: Article (Published version)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)