Magnetic hysteresis of interface-biased flat iron dots

We report a theoretical study of the coercivity and bias of iron dots exchange coupled with an antiferromagnetic substrate. We show that flat dots, with height close to the iron exchange length, and lateral dimensions of a few exchange lengths, exhibit large enhancement of coercivity and exchange bi...

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Principais autores:	Rebouças, G. O. G., Silva, A. S. W. T., Dantas, Ana L., Camley, R. E., Carriço, Artur da Silva
Formato:	article
Idioma:	English
Publicado em:	Physical review B
Assuntos:	Magnetic hysteresis Interface-biased flat iron dots
Endereço do item:	https://repositorio.ufrn.br/jspui/handle/123456789/28817 https://doi.org/10.1103/PhysRevB.79.104402
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id	ri-123456789-28817
record_format	dspace
spelling	ri-123456789-288172020-04-26T07:30:35Z Magnetic hysteresis of interface-biased flat iron dots Rebouças, G. O. G. Silva, A. S. W. T. Dantas, Ana L. Camley, R. E. Carriço, Artur da Silva Magnetic hysteresis Interface-biased flat iron dots We report a theoretical study of the coercivity and bias of iron dots exchange coupled with an antiferromagnetic substrate. We show that flat dots, with height close to the iron exchange length, and lateral dimensions of a few exchange lengths, exhibit large enhancement of coercivity and exchange bias. For small interface field strength the magnetization reversal is nearly a coherent rotation with symmetrical loops. Interface pinning leads to large reduction in coercivity and asymmetrical loops, if the interface field strength is comparable to the value of the iron exchange field. We discuss the impact of geometrical confinement and interface pinning on the magnetization reversal mechanisms. We show that small area dots with height larger than the exchange length display stronger interface effects. 2020-04-20T12:08:54Z 2020-04-20T12:08:54Z 2009-03-04 article REBOUÇAS, G. O. G.; SILVA, A. S. W. T.; DANTAS, Ana L.; CAMLEY, R. E.; CARRIÇO, A. S. Magnetic hysteresis of interface-biased flat iron dots. Physical Review. B, Condensed Matter and Materials Physics, v. 79, p. 104402, 2009. ISSN 1098-0121. DOI https://doi.org/10.1103/PhysRevB.79.104402. Disponível em: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.79.104402 . Acesso em: 20 abr. 2020. 1098-0121 (print), 1550-235X (online) https://repositorio.ufrn.br/jspui/handle/123456789/28817 https://doi.org/10.1103/PhysRevB.79.104402 en application/pdf Physical review B
institution	Repositório Institucional
collection	RI - UFRN
language	English
topic	Magnetic hysteresis Interface-biased flat iron dots
spellingShingle	Magnetic hysteresis Interface-biased flat iron dots Rebouças, G. O. G. Silva, A. S. W. T. Dantas, Ana L. Camley, R. E. Carriço, Artur da Silva Magnetic hysteresis of interface-biased flat iron dots
description	We report a theoretical study of the coercivity and bias of iron dots exchange coupled with an antiferromagnetic substrate. We show that flat dots, with height close to the iron exchange length, and lateral dimensions of a few exchange lengths, exhibit large enhancement of coercivity and exchange bias. For small interface field strength the magnetization reversal is nearly a coherent rotation with symmetrical loops. Interface pinning leads to large reduction in coercivity and asymmetrical loops, if the interface field strength is comparable to the value of the iron exchange field. We discuss the impact of geometrical confinement and interface pinning on the magnetization reversal mechanisms. We show that small area dots with height larger than the exchange length display stronger interface effects.
format	article
author	Rebouças, G. O. G. Silva, A. S. W. T. Dantas, Ana L. Camley, R. E. Carriço, Artur da Silva
author_facet	Rebouças, G. O. G. Silva, A. S. W. T. Dantas, Ana L. Camley, R. E. Carriço, Artur da Silva
author_sort	Rebouças, G. O. G.
title	Magnetic hysteresis of interface-biased flat iron dots
title_short	Magnetic hysteresis of interface-biased flat iron dots
title_full	Magnetic hysteresis of interface-biased flat iron dots
title_fullStr	Magnetic hysteresis of interface-biased flat iron dots
title_full_unstemmed	Magnetic hysteresis of interface-biased flat iron dots
title_sort	magnetic hysteresis of interface-biased flat iron dots
publisher	Physical review B
publishDate	2020
url	https://repositorio.ufrn.br/jspui/handle/123456789/28817 https://doi.org/10.1103/PhysRevB.79.104402
work_keys_str_mv	AT reboucasgog magnetichysteresisofinterfacebiasedflatirondots AT silvaaswt magnetichysteresisofinterfacebiasedflatirondots AT dantasanal magnetichysteresisofinterfacebiasedflatirondots AT camleyre magnetichysteresisofinterfacebiasedflatirondots AT carricoarturdasilva magnetichysteresisofinterfacebiasedflatirondots
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Magnetic hysteresis of interface-biased flat iron dots

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