Multilayered graphene acquires ferromagnetism in proximity with magnetite particles

Seifu, Dereje; Neupane, Suman; Giri, Lily; Karna, Shashi P.; Hong, Haiping; Seehra, M. S.

doi:10.1063/1.4921770

Cited by 13 publications

(2 citation statements)

References 28 publications

(28 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The importance of the 3R phase for device applications has already been noted in the Introduction. More recent developments in this connection include reports of surface superconductivity in the 3R phase [24] and proximity induced room temperature ferromagnetism in a commercial multilayered graphene sample when in contact with magnetite particles [25]. …”

Section: 2h and 3r Phases In Commercial Graphene-based Materialsmentioning

confidence: 99%

Detection and quantification of 2H and 3R phases in commercial graphene-based materials

Seehra

Geddam

Schwegler‐Berry

et al. 2015

Carbon

View full text Add to dashboard Cite

Graphene-based material (GBM) samples acquired from commercial sources are investigated using X-ray diffraction (XRD). Of the 18 GBM samples investigated here, seven samples show XRD patterns with features characteristic of the graphite structure. The XRD patterns of the seven samples are analyzed showing the presence of both the ABA (2H) structure and the ABCA (3R) structure. After de-convoluting the (101) lines of the 2H and 3R structures, the areas under the peaks are used to determine the relative concentrations of the 2H and 3R phases present, typically yielding the ratio 60/40 for 2H/3R. The presence of the 3R structure is important since the 3R structure is a semiconductor with tunable band gap and it is less stable than the 2H structure. The number of layers determined from the analysis of the XRD data varies between 65 and 109 for different samples yielding thickness of the graphite sheets varying between 22 nm and 37 nm. Scanning electron microscopy and transmission electron microscopy of three representative samples confirms the sheet-like morphology and stacking of the graphene layers in the samples. Relevance of these results in connection with their potential applications and toxicology is briefly discussed.

show abstract

Section: 2h and 3r Phases In Commercial Graphene-based Materialsmentioning

confidence: 99%

Detection and quantification of 2H and 3R phases in commercial graphene-based materials

Seehra

Geddam

Schwegler‐Berry

et al. 2015

Carbon

View full text Add to dashboard Cite

show abstract

“…[16][17][18] Different approaches to achieve room temperature ferromagnetism in Gr have been reported by using magnetic nanoparticles (MNPs) with focus on the surface shape of matrix and the uniformity of MNPs on the surface of Gr multilayer. [19] However, study on particle size and distribution on the surface of Gr plates is rare.…”

Section: Introductionmentioning

confidence: 99%

Effect of YIG nanoparticle size and clustering in proximity-induced magnetism in graphene/YIG composite probed with magnetoimpedance sensors: Towards improved functionality, sensitivity and proximity detection

Hosseinzadeh

Jamilpanah

Gharehbagh

et al. 2019

Composites Part B: Engineering

View full text Add to dashboard Cite

Proximity-induced magnetism (PIM) in graphene (Gr) adjacent to magnetic specimen has raised great fundamental interests. The subject is under debate and yet no application is proposed and granted. In this paper, toward accomplishment of fundamental facts, we first explore the effect of particle size and clustering in the PIM in Gr nanoplates (GNPs)/yttrium iron garnet (YIG) magnetic nanoparticle (MNP) composite. Microscopic analyzes suggest that fine MNPs distributed uniformly on the GNPs have higher saturation magnetization due to the PIM in Gr. We propose that such magnetic plates can thus be used to shield the stray field generated on the surface of magnetic sensors and play a role as a magnetic lens to prevent the field emanating outside the body of magnetic specimen. The GNPs/YIG composites are coated on a magnetic ribbon and proposed for application in magneto-impedance (MI) sensors. We show that such planar magnetic flakes enhance the MI response against the external applied magnetic field significantly. The suggested application can be furthermore developed toward bio-sensing and magnetic shielding in different magnetic sensors and devices.

show abstract

Room‐Temperature Ferromagnetism and Fermi Level Pinning in Multilayer Graphene Films Derived from Ferrocene

Wu,

Jiang,

Cui

et al. 2023

Adv Funct Materials

View full text Add to dashboard Cite

Spin polarization is a very important condition for spintronics applications which can easily be achieved by using ferromagnetic materials. Graphene‐based magnetic materials, which have long spin lifetime and diffusion length, are very promising as spin channel materials. In this work, Ferrocene molecules are chosen as the precursor carbon source using the chemical vapor deposition method, facilitating the synthesis of multilayer graphene films decorated with magnetic nanoclusters. This resultant material manifested planar ferromagnetism with a Curie temperature exceeding room temperature (≥300 K) and a saturation magnetization as high as 4.1 × 10−7 emu mm−2. The robust ferromagnetic coupling can plausibly be attributed to the presence of magnetic nanoclusters interspersed within the synthesized graphene, enhancing the localized magnetic moment and promoting ferromagnetic long‐range ordering. Furthermore, the Fermi level pinning at the Dirac point is observed and predominantly ascribed to the pervasive defects in the graphene derived from ferrocene. The oxygen functional groups within these defects act as charge traps, effectively anchoring the Fermi level to the Dirac point, intrinsically suppressing the ambipolar behavior of graphene. This work sheds light on potential avenues for the exploration of novel, high‐performance carbonaceous spintronics materials with economic feasibility.

show abstract

Multilayered graphene acquires ferromagnetism in proximity with magnetite particles

Cited by 13 publications

References 28 publications

Detection and quantification of 2H and 3R phases in commercial graphene-based materials

Detection and quantification of 2H and 3R phases in commercial graphene-based materials

Effect of YIG nanoparticle size and clustering in proximity-induced magnetism in graphene/YIG composite probed with magnetoimpedance sensors: Towards improved functionality, sensitivity and proximity detection

Room‐Temperature Ferromagnetism and Fermi Level Pinning in Multilayer Graphene Films Derived from Ferrocene

Contact Info

Product

Resources

About