SUPPLEMENTARY INFORMATION
Single Domain SmCo5@Co Exchange-coupled Magnets
Sm[Co(CN)6]·4H2O@GO Particles: A Novel Chemcial Approach
Prepared
from
Core/shell
Ce Yang,1 Lihui Jia,2 Shouguo Wang,3 Chen Gao,2 Dawei Shi,3 Yanglong Hou1 and Song Gao2
Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing
100871, China, 2College of Chemistry and Molecular Engineering, Peking University, Beijing 100871,
China, 3Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
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Figure S1. a) Photos of Sm[Co(CN)6]·4H2O, b) coherently wrapped Sm[Co(CN)6]·4H2O@GO and c)
partially wrapped Sm[Co(CN)6]·4H2O@GO, respectively. d) TEM image of partially wrapped
Sm[Co(CN)6]·4H2O@GO particles. According to the TEM image, Sm[Co(CN)6]·4H2O crystals were merely
adhered to the surface of GO without been fully wrapped. Consequently, such partically wrapped
Sm[Co(CN)6]·4H2O@GO exhibited dual color as shown in c).
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Figure S2. a-c) Structure of Sm[Co(CN)6]·4H2O unit cell viewed along X-axis, Y-axis and Z-axis,
respectively. d) Structure of Sm[Co(CN)6]·4H2O crystals viewed along X-axis (Sm green, Co blue, C
black, N yellow, O red, H grey).
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Figure S3. Topography and magnetic structure analysis. a, b) 235*235 nm AFM (a) and MFM (b)
images of single domain SmCo5@Co particles. Vertical scales (from brown to white): 0 to 300 nm and
0° to 11°, respectively. c, d) 300*300 nm AFM (c) and MFM (d) images of multi-domain SmCo5 particles.
Vertical scales (from brown to white): 0 to 200 nm and 0° to 10°, respectively.
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Figure S4. Profile of EDS line scan indicated in Figure 3.
Figure S5. TEM images of (a) typical as-synthesized SmCo5 particles and (b) an isolated SmCo5
particle.
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Figure S6. B-H loop of single domain SmCo5@Co magnets (blue line) and multi-domain SmCo5
magnets (red line).
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Figure S7. XRD patterns of products with various Co/Sm ratios in the starting materials. a) Co/Sm =
3.5, b) Co/Sm = 3.7 and c) Co/Sm = 4.
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Figure S8. Detailed structural information of SmCo5@9% Sm2Co17 magnets. a) STEM image of the
magnets. The red lines indicated EDS scan lines. b, c) Profiles of EDS line scan correspond to line 1 and
2 in a), respectively. d) HRTEM image of the edge of SmCo5@9% Sm2Co17 magnet.
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Figure S9. XRD patterns of products with various Co/Sm ratios in the starting materials. a) Co/Sm =
4.3, b) Co/Sm = 5 and c) Co/Sm = 5.5.
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Figure S10. Detailed structural information of SmCo5@40% Sm2Co17 magnets. a) STEM image of the
magnets. The red lines indicated EDS scan lines. b, c) Profiles of EDS line scan correspond to line 1 and
2 in a), respectively. d) HRTEM image of the edge of SmCo5@40% Sm2Co17 magnet.
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Figure S11. a) XRD pattern of as-synthesized Sm2Co17@Co magnets. The black lines are the standard
diffraction pattern of Sm2Co17 (JCPDS No. 19-0359) and the green lines are the standard diffraction
pattern of Co (JCPDS No. 15-0806). b) HRTEM image of the exterior part of Sm2Co17@Co magnets. c)
Room temperature hysteresis loop of Sm2Co17@Co magnets.
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