Unexpected room-temperature ferromagnetism in bulk ZnO

Yu Chun Chen; Eberhard Goering; Lars Jeurgens; Zumin Wang; Fritz Phillipp; Johannes Baier; Thomas Tietze; Gisela Schütz

doi:10.1063/1.4825268

Unexpected room-temperature ferromagnetism in bulk ZnO

Yu Chun Chen, Eberhard Goering, Lars Jeurgens, Zumin Wang, Fritz Phillipp, Johannes Baier, Thomas Tietze, Gisela Schütz

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

Abstract

It is demonstrated that a transition from paramagnetic behavior to clear room-temperature ferromagnetism (RTFM) exists in pure bulk ZnO. A significant enhancement of RTFM has been observed in argon-annealed ZnO samples. Quantitative chemical analysis unambiguously indicates that oxygen-related vacancies at surface play a crucial role in this observed RTFM. We suppose that the surface magnetic states, paramagnetic in the pure nanoparticles, are converted to ferromagnetic phase after mechanical compaction. Additionally, it is found that weakly adsorbed carbon species could block the exchange coupling between isolated magnetic moments in the surface layers.

Original language	English
Article number	162405
Journal	Applied Physics Letters
Volume	103
Issue number	16
DOIs	https://doi.org/10.1063/1.4825268
State	Published - 14 Oct 2013
Externally published	Yes

Access to Document

10.1063/1.4825268

Cite this

@article{fa988dd328814220a9478e92b7584466,

title = "Unexpected room-temperature ferromagnetism in bulk ZnO",

abstract = "It is demonstrated that a transition from paramagnetic behavior to clear room-temperature ferromagnetism (RTFM) exists in pure bulk ZnO. A significant enhancement of RTFM has been observed in argon-annealed ZnO samples. Quantitative chemical analysis unambiguously indicates that oxygen-related vacancies at surface play a crucial role in this observed RTFM. We suppose that the surface magnetic states, paramagnetic in the pure nanoparticles, are converted to ferromagnetic phase after mechanical compaction. Additionally, it is found that weakly adsorbed carbon species could block the exchange coupling between isolated magnetic moments in the surface layers.",

author = "Chen, {Yu Chun} and Eberhard Goering and Lars Jeurgens and Zumin Wang and Fritz Phillipp and Johannes Baier and Thomas Tietze and Gisela Sch{\"u}tz",

year = "2013",

month = oct,

day = "14",

doi = "10.1063/1.4825268",

language = "English",

volume = "103",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "16",

}

TY - JOUR

T1 - Unexpected room-temperature ferromagnetism in bulk ZnO

AU - Chen, Yu Chun

AU - Goering, Eberhard

AU - Jeurgens, Lars

AU - Wang, Zumin

AU - Phillipp, Fritz

AU - Baier, Johannes

AU - Tietze, Thomas

AU - Schütz, Gisela

PY - 2013/10/14

Y1 - 2013/10/14

N2 - It is demonstrated that a transition from paramagnetic behavior to clear room-temperature ferromagnetism (RTFM) exists in pure bulk ZnO. A significant enhancement of RTFM has been observed in argon-annealed ZnO samples. Quantitative chemical analysis unambiguously indicates that oxygen-related vacancies at surface play a crucial role in this observed RTFM. We suppose that the surface magnetic states, paramagnetic in the pure nanoparticles, are converted to ferromagnetic phase after mechanical compaction. Additionally, it is found that weakly adsorbed carbon species could block the exchange coupling between isolated magnetic moments in the surface layers.

AB - It is demonstrated that a transition from paramagnetic behavior to clear room-temperature ferromagnetism (RTFM) exists in pure bulk ZnO. A significant enhancement of RTFM has been observed in argon-annealed ZnO samples. Quantitative chemical analysis unambiguously indicates that oxygen-related vacancies at surface play a crucial role in this observed RTFM. We suppose that the surface magnetic states, paramagnetic in the pure nanoparticles, are converted to ferromagnetic phase after mechanical compaction. Additionally, it is found that weakly adsorbed carbon species could block the exchange coupling between isolated magnetic moments in the surface layers.

UR - http://www.scopus.com/inward/record.url?scp=84886438217&partnerID=8YFLogxK

U2 - 10.1063/1.4825268

DO - 10.1063/1.4825268

M3 - Article

AN - SCOPUS:84886438217

SN - 0003-6951

VL - 103

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 16

M1 - 162405

ER -

Unexpected room-temperature ferromagnetism in bulk ZnO

Abstract

Access to Document

Other files and links

Fingerprint

Cite this