TY - JOUR
T1 - Scale-Enhanced Magnetism in Exfoliated Atomically Thin Magnetite Sheets
AU - Puthirath, Anand B.
AU - Shirodkar, Sharmila N.
AU - Gao, Guanhui
AU - Hernandez, Francisco C.Robles
AU - Deng, Liangzi
AU - Dahal, Rabin
AU - Apte, Amey
AU - Costin, Gelu
AU - Chakingal, Nithya
AU - Balan, Aravind Puthirath
AU - Sassi, Lucas M.
AU - Tiwary, Chandra Sekhar
AU - Vajtai, Robert
AU - Chu, Ching Wu
AU - Yakobson, Boris I.
AU - Ajayan, Pulickel M.
N1 - Publisher Copyright:
© 2020 Wiley-VCH GmbH
PY - 2020/11/12
Y1 - 2020/11/12
N2 - The discovery of ferromagnetism in atomically thin layers at room temperature widens the prospects of 2D materials for device applications. Recently, two independent experiments demonstrated magnetic ordering in two dissimilar 2D systems, CrI3 and Cr2Ge2Te6, at low temperatures and in VSe2 at room temperature, but observation of intrinsic room-temperature magnetism in 2D materials is still a challenge. Here a transition at room temperature that increases the magnetization in magnetite while thinning down the bulk material to a few atom-thick sheets is reported. DC magnetization measurements prove ferrimagnetic ordering with increased magnetization and density functional theory calculations ascribe their origin to the low dimensionality of the magnetite layers. In addition, surface energy calculations for different cleavage planes in passivated magnetite crystal agree with the experimental observations of obtaining 2D sheets from non-van der Waals crystals.
AB - The discovery of ferromagnetism in atomically thin layers at room temperature widens the prospects of 2D materials for device applications. Recently, two independent experiments demonstrated magnetic ordering in two dissimilar 2D systems, CrI3 and Cr2Ge2Te6, at low temperatures and in VSe2 at room temperature, but observation of intrinsic room-temperature magnetism in 2D materials is still a challenge. Here a transition at room temperature that increases the magnetization in magnetite while thinning down the bulk material to a few atom-thick sheets is reported. DC magnetization measurements prove ferrimagnetic ordering with increased magnetization and density functional theory calculations ascribe their origin to the low dimensionality of the magnetite layers. In addition, surface energy calculations for different cleavage planes in passivated magnetite crystal agree with the experimental observations of obtaining 2D sheets from non-van der Waals crystals.
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U2 - 10.1002/smll.202004208
DO - 10.1002/smll.202004208
M3 - Article
C2 - 33078566
AN - SCOPUS:85092697004
SN - 1613-6810
VL - 16
JO - Small
JF - Small
IS - 45
M1 - 2004208
ER -