Perturbative measurement of magnetoresistance

Oliveira, Alexandre Barbosa de; Melo, A. C. C.; Costa, R. B.; Costa, N. P.; Azevedo, A.; Feitosa, Carlos Chesman de Araújo

Perturbative measurement of magnetoresistance

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dc.contributor.author	Oliveira, Alexandre Barbosa de
dc.contributor.author	Melo, A. C. C.
dc.contributor.author	Costa, R. B.
dc.contributor.author	Costa, N. P.
dc.contributor.author	Azevedo, A.
dc.contributor.author	Feitosa, Carlos Chesman de Araújo
dc.date.accessioned	2020-04-29T20:18:56Z
dc.date.available	2020-04-29T20:18:56Z
dc.date.issued	2018-12-21
dc.description.resumo	In this paper, we report the development of a novel technique in which the magnetoresistance of nanostructures is perturbatively measured by transversally modulating the DC magnetic field. It measures the electrical transport counterpart of the transverse magnetic AC-susceptibility. The technique was developed in a conventional four-probe configuration in which a small DC current flows through the sample and a small transverse AC-field perturbates the equilibrium position of the sample magnetization. Lock-in detection, in-phase with the AC-perturbation, is used to measure the voltage signal between the two inner electrodes of the four-probe station. We successfully demonstrated that this signal is proportional to the product of the first derivative of sample resistance with respect to the equilibrium position of the magnetization times the second derivative of the energy with respect to the equilibrium position of the magnetization. These dependences add new features to the technique investigated here that were not captured by the investigations previously reported on the same subject. To show the effective use of the technique, we discuss its application in measuring magnetic properties of thin magnetic films in the non-saturated regime.	pt_BR
dc.identifier.citation	OLIVEIRA, Alexandre Barbosa de et al. Perturbative measurement of magnetoresistance. Review of Scientific Instruments, v. 89, p. 125115, 2018. ISSN 1089-7623 versão online. DOI https://doi.org/10.1063/1.5047661. Disponível em: https://aip.scitation.org/doi/10.1063/1.5047661. Acesso em: 29 abr. 2020.	pt_BR
dc.identifier.doi	https://doi.org/10.1063/1.5047661
dc.identifier.issn	0034-6748 (print), 1089-7623 (online)
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/28836
dc.language	en	pt_BR
dc.publisher	AIP Publishing	pt_BR
dc.subject	Perturbative measurement	pt_BR
dc.subject	Magnetoresistance	pt_BR
dc.title	Perturbative measurement of magnetoresistance	pt_BR
dc.type	article	pt_BR