Structural and paramagnetic properties of dilute<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Ga</mml:mtext></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Mn</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:mtext>N</mml:mtext></mml:mrow></mml:math>

Stefanowicz, W.; Sztenkiel, D.; Faina, B.; Grois, Andreas; Rovezzi, Mauro; Devillers, Thibaut; d’Acapito, Francesco; Navarro-Quezada, A.; Li, Tian; Jakieła, R.; Sawicki, M.; Dietl, T.; Bonanni, A.

doi:10.1103/physrevb.81.235210

Cited by 84 publications

(109 citation statements)

References 79 publications

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“…• C, 17 here the flow-rate of the Ga precursor (TMGa) is reduced to 1 standard cubic centimeter per minute (sccm), maintaining the temperature of the Mn precursor source (MeCp 2 Mn) at 22…”

Section: Growth Methods and Studied Samplesmentioning

confidence: 99%

Experimental probing of exchange interactions between localized spins in the dilute magnetic insulator (Ga,Mn)N

et al. 2011

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The sign, magnitude, and range of the exchange couplings between pairs of Mn ions is determined for (Ga,Mn)N and (Ga,Mn)N:Si with x 3%. The samples have been grown by metalorganic vapor phase epitaxy and characterized by secondary-ion mass spectroscopy; high-resolution transmission electron microscopy with capabilities allowing for chemical analysis, including the annular dark-field mode and electron energy loss spectroscopy; high-resolution and synchrotron x-ray diffraction; synchrotron extended x-ray absorption fine-structure; synchrotron x-ray absorption near-edge structure; infra-red optics and electron spin resonance. The results of high resolution magnetic measurements and their quantitative interpretation have allowed to verify a series of ab initio predictions on the possibility of ferromagnetism in dilute magnetic insulators and to demonstrate that the interaction changes from ferromagnetic to antiferromagnetic when the charge state of the Mn ions is reduced from 3+ to 2+.

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Section: Growth Methods and Studied Samplesmentioning

confidence: 99%

Experimental probing of exchange interactions between localized spins in the dilute magnetic insulator (Ga,Mn)N

et al. 2011

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“…5,13 Prior to Raman spectroscopy, the structural, magnetic, and chemical properties of the samples are extensively investigated 5 and in particular the crystalline structure is analysed by synchrotron high-resolution x-ray diffraction and high-resolution transmission electron microscopy, showing that all samples are single-crystalline and do not include secondary phases. Furthermore, synchrotron x-ray absorption fine structure (EXAFS) studies demonstrate that at least 95% of the Mn ions substitutes Ga cations, 14 and we have reported that in the case of Mn-Mg codoping, both Mn and Mg occupy Ga substitutional sites, and Mg tends to stay close to Mn, separated by one N atom, to form Mn-Mg k cation complexes, where k is the number of Mg ions in the first cation shell of a single Mn. 5 The Mn and Mg concentrations x Mn and x Mg are extracted from secondary ion mass spectroscopy (SIMS) and lie between 0% and 1%.…”

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confidence: 99%

Functional Mn–Mgk cation complexes in GaN featured by Raman spectroscopy

Devillers

Leite

Silva

et al. 2013

Applied Physics Letters

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The evolution of the optical branch in the Raman spectra of (Ga,Mn)N:Mg epitaxial layers as a function of the Mn and Mg concentrations, reveals the interplay between the two dopants. We demonstrate that the various Mn-Mg-induced vibrational modes can be understood in the picture of functional Mn–Mgk complexes formed when substitutional Mn cations are bound to k substitutional Mg through nitrogen atoms, the number of ligands k being driven by the ratio between the Mg and the Mn concentrations.

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“…Nevertheless, the artifacts are visible in other data of low signal measurements recorded with various MPMS machines, e. g., on Cr-doped InN [17], GaAs single crystals [18] or Gd ion implanted cubic GaN [19], GaN doped with Fe [15], GaN doped with Mn [20]. Therefore they…”

Section: Commercial Squid Magnetometry a General Remarksmentioning

confidence: 99%

“…Let's imagine now that this is not a pure test-substrate but a typical sample consisting of a thin paramagnetic DMS layer deposited on a similar sapphire substrate. A recent investigation of x < 1% (Ga,Mn)N is a good example of such a study, see [20]. Taking a typical thickness of the DMS layer of ∼ 200 nm one easily notices that S, the value of spin per each Mn is proportional to 1/x(%).…”

Section: Superconducting Coilmentioning

confidence: 99%

“…Secondly, there would be no magnetic signal from an infinitely (= sufficiently compared to the size of the gradiometer) long object, providing it is magnetically uniform, independently whether it moves or not and what kind of magnetic response dominates its properties. Practically, anything of a length of [15][16][17][18][19][20] cm what allows to fix the sample close to its center and has got an adaptor connecting it with the main (long) sample rod will work for sensitive magnetometry, however, the least 'magnetic', the better. The MPMS XL system manufacturer advices to use clear drinking straws as sample holders.…”

Section: Sample Mountingmentioning

confidence: 99%

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Sensitive SQUID magnetometry for studying nanomagnetism

Sawicki

Stefanowicz

Ney

2011

Semicond. Sci. Technol.

174

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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Structural and paramagnetic properties of diluteGa1−xMnxN

Cited by 84 publications

References 79 publications

Experimental probing of exchange interactions between localized spins in the dilute magnetic insulator (Ga,Mn)N

Experimental probing of exchange interactions between localized spins in the dilute magnetic insulator (Ga,Mn)N

Functional Mn–Mgk cation complexes in GaN featured by Raman spectroscopy

Sensitive SQUID magnetometry for studying nanomagnetism

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