Limitations of measuring small magnetic signals of samples deposited on a diamagnetic substrate

Ney, Andreas; Kammermeier, T.; Ney, V.; Ollefs, Katharina; Ye, Shuangli

doi:10.1016/j.jmmm.2008.07.008

Cited by 64 publications

(55 citation statements)

References 13 publications

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“…Although resembling a ferromagnetic response, such a shape is caused by the presence of the trapped flux H tr in the superconducting magnet. Other evidence for the dependence of this type of residual hysteresis in net-diamagnetic samples on the history of the magnet has been provided before [27]. Here it will be demonstrated that identical residual hysteresis with opposite chirality can be recorded when paramagnetic samples are used.…”

Section: Superconducting Coilmentioning

confidence: 63%

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Sensitive SQUID magnetometry for studying nanomagnetism

Sawicki

Stefanowicz

Ney

2011

Semicond. Sci. Technol.

180

152

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The superconducting quantum interference device (SQUID) magnetometer is one of the most sensitive experimental techniques to magnetically characterize samples with high sensitivity. Here we present a detailed discussion of possible artifacts and pitfalls characteristic for commercial SQUID magnetometers. This includes intrinsic artifacts which stem from the inherent design of the magnetometer as well as potential issues due to the user. We provide some guidelines how to avoid and correct these, which is of particular importance when the proper magnetization of nano-scale objects shall be established in cases where its response is dwarfed by that of the substrate it comes with, a situation frequently found in the field of nano-magnetism.

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Section: Superconducting Coilmentioning

confidence: 63%

“…As the example of such an effect we discuss a room temperature hysteresis loop m(H J ) collected for a sapphire substrate. It is important to note that there may exist a 'genuine' FM component in sapphire [14] and in particular in a non-properly handled sapphire [27]. We discuss this issue further in this review (chapter III).…”

Section: Superconducting Coilmentioning

confidence: 98%

Sensitive SQUID magnetometry for studying nanomagnetism

Sawicki

Stefanowicz

Ney

2011

Semicond. Sci. Technol.

180

152

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“…The diamagnetic contribution of the sapphire substrate has been derived from the M(H) curve recorded at 300 K and subtracted from all data and great care has been taken to avoid the various measurement artifacts for these kind of samples. 20,21 M(T) curves were measured in a field of 10 mT while warming from 2 K to 300 K after the sample was either cooled down from 300 K to 2 K in 5 T (field heated (FH)) or in zero-field cooling (ZFC). For better comparability of the data, the magnetization data were normalized with respect to the sample area which neglects variations of the film thickness of the order of 10%.…”

Section: Methodsmentioning

confidence: 99%

Co and Cu co-doped ZnO epitaxial films—A magnetically soft nano-composite

Ney

Venkataraman

Henne

et al. 2016

Journal of Applied Physics

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A series of Co/Cu co-doped ZnO epitaxial films has been grown on sapphire substrates to investigate the possibilities of tailoring the magnetic properties in functional ZnO-Co/Cu nano-composites. The growth was performed using reactive magnetron sputtering varying the oxygen partial pressure to tune the incorporation of the dopants and the resulting valence state. At high oxygen pressures, Co2+ is formed and the resulting magnetic properties are very similar to phase pure paramagnetic Co-doped ZnO samples. However, the formation of a secondary CuO phase reduces the overall structural quality of the layers and virtually no substitutional incorporation of Cu2+ in ZnO could be evidenced. At low oxygen pressures, a significant fraction of metallic Co and Cu forming nanometer-sized superparamagnetic precipitates of a Co/Cu alloy can be evidenced which are embedded in a ZnO host matrix.

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“…The hysteresis loops of the FePt films grown on MgO ( Fig.4(a)) and on STO (Fig.4(b)) show easy magnetization c-axis oriented perpendicular to the film plane. In the latter, an artifact of the SQUID measurement is present close to the zero applied field, which is due to change in sensitivity scale and/or sample contaminations [8]. Relevant magnetic properties of thin films are reported in table 1.…”

Section: Sto At 450mentioning

confidence: 99%