Structure and magnetism of Ge3Mn5 clusters

Jain, A.; Jamet, M.; Barski, A.; Devillers, Thibaut; Yu, Ing-Song; Porret, Clément; Bayle–Guillemaud, Pascale; Favre‐Nicolin, V.; Gambarelli, Serge; Maurel, Vincent; Desfonds, G.; Jacquot, Jean-François; Tardif, Samuel

doi:10.1063/1.3531222

Cited by 21 publications

(17 citation statements)

References 20 publications

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“…Unfortunately the ferromagnetic germanides such as Mn 5 Ge 3 with a T C =296 K are thermodynamically stable phases 23 , and no such stable compounds exist in the Ge-rich part of the phase diagram below 1000 K. Successful magnetic doping and achieving DMS-type behavior therefore requires kinetic stabilization of bonding environments, which support the desired magnetic interaction. The complexity of the Ge-Mn system stems from the variability in the spatial distribution of Mn (isolated dopant atoms, Mn-rich clusters, Mn-metal clusters) [13][14][15]18,[24][25][26][27][28][29][30][31] , and the formation of secondary stable and metastable germanide phases 32,33 . The collective expression of these material characteristics determines the type and strength of spin interactions within the Ge-Mn system.…”

Section: Introductionmentioning

confidence: 99%

“…It was predicted a decade ago that Mn-doped Ge might present the field-controlled ferromagnetism [8][9][10][11] of a dilute magnetic semiconductor (DMS), which has lead to a sizeable number of studies presenting a wide range of T C between 5 K and 400 K [10][11][12][13][14][15][16][17][18][19][20][21][22] . Figure 1 summarizes some of the recently studied Mn-Ge materials and T C is used as a general signature of their magnetic properties [10][11][12][13][14][15][16][17][18][19][20][21][22] .…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1 summarizes some of the recently studied Mn-Ge materials and T C is used as a general signature of their magnetic properties [10][11][12][13][14][15][16][17][18][19][20][21][22] . The considerable spread in T C is presumably tied to the variability in bonding sites and structures achieved with different approaches to material synthesis.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic doping of Ge-quantum dots: growth studies exploring the feasibility of modulating QD properties

et al. 2014

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o 0 10 15 20 sample number Figure 1: Compendium of literature data of Curie temperatures for Ge -Mn thin films and nanostructures fabricated using a wide range of deposition methods. This is by no means a complete list but illustrates the breadth in growth methods and magnetic performance which has been reported in recent years. ABSTRACTThe magnetic doping of Ge-QDs is highly coveted and has been pursued for several years. The Ge-Mn-Si substrate system presents a complex challenge, and the competition between dopant integration and formation of silicides, germanides and metastable phases makes the magnetic doping a considerable, and maybe insurmountable challenge. We will discuss the interaction of Mn with all growth surface, Si(100), Ge(100) wetting layer, and Ge{105} QD facet, as well as the co-deposition of Mn and Ge. The monoatomic Mn-wires, which form on Si(100), and their magnetic signatures allow unique insight into the relation between bonding and magnetism. We will close with an outlook on the feasibility of QD manipulation by controlling dopant-surface interactions. KEYWORD LISTGe-quantum dot, doping, spintronics, germanide, Scanning tunneling microscopy, metastable phase, dilute magnetic semiconductor, ferromagnetism. Curie temperature

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic doping of Ge-quantum dots: growth studies exploring the feasibility of modulating QD properties

et al. 2014

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“…There are several reports on the magnetic and structural properties of Mn 5 Ge 3 in the form of thin films [23,24], nanoislands [25], and nanomagnets embedded in semiconductor matrices by ion implantation and molecular beam epitaxy [26,27,28,29,30]. It has been reported that, regardless of the fabrication method used, precipitates of small Mn 5 Ge 3 nanoclusters may occur due to the high growth temperature as well as the Mn content exceeding the low solubility in Ge [31,32,33].…”

Section: Introductionmentioning

confidence: 99%

Structure and Magnetism of Mn5Ge3 Nanoparticles

et al. 2018

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In this work, we investigated the magnetic and structural properties of isolated Mn5Ge3 nanoparticles prepared by the cluster-beam deposition technique. Particles with sizes between 7.2 and 12.6 nm were produced by varying the argon pressure and power in the cluster gun. X-ray diffraction (XRD)and selected area diffraction (SAD) measurements show that the nanoparticles crystallize in the hexagonal Mn5Si3-type crystal structure, which is also the structure of bulk Mn5Ge3. The temperature dependence of the magnetization shows that the as-made particles are ferromagnetic at room temperature and have slightly different Curie temperatures. Hysteresis-loop measurements show that the saturation magnetization of the nanoparticles increases significantly with particle size, varying from 31 kA/m to 172 kA/m when the particle size increases from 7.2 to 12.6 nm. The magnetocrystalline anisotropy constant K at 50 K, determined by fitting the high-field magnetization data to the law of approach to saturation, also increases with particle size, from 0.4 × 105 J/m3 to 2.9 × 105 J/m3 for the respective sizes. This trend is mirrored by the coercivity at 50 K, which increases from 0.04 T to 0.13 T. A possible explanation for the magnetization trend is a radial Ge concentration gradient.

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“…However, in our case we have (Ge,Mn) nanostructures but still the same approach has been used. We have tested our method to determine magnetic anisotropy constants using both EPR and SQUID measurements on Ge 3 Mn 5 films grown on Ge(111) substrates [23].…”

Section: Sample Growth and Experimental Detailsmentioning

confidence: 99%

Magnetic anisotropy of (Ge,Mn) nanostructures

Jain¹,

Jamet²,

Barski³

et al. 2011

J. Phys.: Conf. Ser.

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Abstract. We present a correlation between structural and magnetic properties of different (Ge,Mn) nanostructures grown on Ge(001) and Ge(111) substrates. Thin films of Ge1−xMnx were grown by low temperature molecular beam epitaxy to favor the out-of-equilibrium growth. Depending on the growth conditions crystalline or amorphous (Ge,Mn) nanocolumns have been observed on Ge(001) substrates. The magnetic properties were probed by superconducting quantum interference device (SQUID), vibrating sample magnetometer (VSM) and electron paramagnetic resonance (EPR). With the help of these complementary techniques (SQUID and EPR), magnetic anisotropy in these nanostructures has been investigated and different anisotropy constants were calculated.

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Structure and magnetism of Ge3Mn5 clusters

Cited by 21 publications

References 20 publications

Magnetic doping of Ge-quantum dots: growth studies exploring the feasibility of modulating QD properties

Magnetic doping of Ge-quantum dots: growth studies exploring the feasibility of modulating QD properties

Structure and Magnetism of Mn5Ge3 Nanoparticles

Magnetic anisotropy of (Ge,Mn) nanostructures

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