Oxygen effect on spin reorientation transition of CoNi alloy films on Cu(001)

Autor:	Ying-Ta Shih, Wei Pan, Zheng-Zhe Wu
Rok vydání:	2011
Předmět:	Materials science Magnetic domain Condensed matter physics Oxide General Physics and Astronomy chemistry.chemical_element Coercivity Magnetic hysteresis Oxygen Magnetization chemistry.chemical_compound Hysteresis Exchange bias chemistry
Zdroj:	Journal of Applied Physics. 109:07C112
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.3561765
Popis:	Combinations of CoNi alloying and oxygen exposure are used in order to study the spin reorientation transition (SRT) in Ni/Cu(001). These modifications on the volume layers or on the surface layers may result in an increase or decrease of the critical thickness (tc) of the SRT, respectively. We present the study on the magnetic properties of the oxygen exposure on Co5Ni95/Cu(001) ultrathin films. For films with a thickness below tc, a certain amount of oxygen exposure drives the SRT, whereas a large amount of oxygen demolishes the magnetization. For films with a thickness above tc, the out-of-plane magnetization persists under a large amount of oxygen exposure. Two-domain-like state and coercivity enhancement are found in the hysteresis loops. The results imply that oxygen adsorbates may drive the SRT and a large amount of oxygen may lead to the formation of antiferromagnetic oxide on the surface layers. Coercivity enhancement may refer to the exchange bias coupling, which provides the opportunity in appl...
Databáze:	OpenAIRE
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