Organization and controlled coupling between soft and hard magnetic nanocrystals using mesoporous materials
Source abstract
Abstract
Mesoporous materials provide a unique host for controlling interactions between nanoscale guests. Here, we use polymer-templated mesoporous silicas to control magnetic dipole-dipole coupling between soft (superparamagnetic) face-centered-cubic and hard (ferromagnetic) face-centered-tetragonal FePt nanocrystals. We find that mixed soft-hard coupled FePt chains show enhanced magnetic coercivity, compared to single-component chains, while randomly associated nanocrystals show no change. A semi-quantitative analysis of temperature dependent magnetization data indicates that the free-energy barrier to spin flipping has both significant enthalpic and entropic components. Linear channels, thus, appear to be an effective way to organize magnetic nanocrystals with constructive dipolar coupling and tunable magnetic properties.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Magnetic properties of thin films · Mesoporous Materials and Catalysis · Theoretical and Computational Physics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry and Biochemistry, UCLA, Los Angeles, California 90095-1569, USA
Department of Materials Science and Engineering, UCLA, Los Angeles, California 90095, USA
The California NanoSystem Institute, UCLA, Los Angeles, California 90095, USA
Funding
UC Discovery · National Science Foundation · Semiconductor Research Corporation
References (85)
Show source-provided references
1. 10.1039/b901742a10.1039/b901742a ↗
2. 10.1002/smll.20110270810.1002/smll.201102708 ↗
3. 10.1039/B502849N10.1039/B502849N ↗
4. 10.1016/j.micromeso.2014.02.03310.1016/j.micromeso.2014.02.033 ↗
5. 10.1016/j.micromeso.2014.03.03210.1016/j.micromeso.2014.03.032 ↗
6. 10.1038/nnano.2007.29410.1038/nnano.2007.294 ↗
7. 10.1039/b907308f10.1039/b907308f ↗
8. 10.1039/c1cc14502a10.1039/c1cc14502a ↗
9. 10.1039/b507418e10.1039/b507418e ↗
10. 10.1021/la903830410.1021/la9038304 ↗
11. 10.1039/c3ra42566e10.1039/c3ra42566e ↗
12. 10.1155/2012/26986110.1155/2012/269861 ↗
13. 10.1021/jp034240n10.1021/jp034240n ↗
14. 10.1021/cm800551h10.1021/cm800551h ↗
15. 10.1016/j.matlet.2009.12.04510.1016/j.matlet.2009.12.045 ↗
16. 10.1109/20.80913410.1109/20.809134 ↗
17. 10.1063/1.300158910.1063/1.3001589 ↗
18. 10.1103/PhysRevLett.95.15720410.1103/PhysRevLett.95.157204 ↗
19. 10.1126/science.287.5457.146610.1126/science.287.5457.1466 ↗
20. 10.1063/1.167605310.1063/1.1676053 ↗
21. 10.1021/cm960077f10.1021/cm960077f ↗
22. 10.1103/PhysRev.130.167710.1103/PhysRev.130.1677 ↗
23. 10.1016/S0304-8853(99)00645-910.1016/S0304-8853(99)00645-9 ↗
24. 10.1103/PhysRevB.74.02442010.1103/PhysRevB.74.024420 ↗
25. 10.1016/S0304-8853(03)00267-110.1016/S0304-8853(03)00267-1 ↗
26. 10.1016/j.jmmm.2005.03.02210.1016/j.jmmm.2005.03.022 ↗
27. 10.1016/j.tsf.2008.10.04010.1016/j.tsf.2008.10.040 ↗
28. 10.1063/1.306833010.1063/1.3068330 ↗
29. 10.1063/1.157851510.1063/1.1578515 ↗
30. 10.1038/nature0120810.1038/nature01208 ↗
31. 10.1063/1.146797610.1063/1.1467976 ↗
32. 10.1088/0022-3727/33/6/30410.1088/0022-3727/33/6/304 ↗
33. 10.1016/0304-8853(92)90174-M10.1016/0304-8853(92)90174-M ↗
34. 10.1103/PhysRev.100.106010.1103/PhysRev.100.1060 ↗
35. 10.1023/A:101793750223410.1023/A:1017937502234 ↗
36. 10.1063/1.188276510.1063/1.1882765 ↗
37. 10.1126/science.105755310.1126/science.1057553 ↗
38. 10.1002/adma.20080162010.1002/adma.200801620 ↗
39. 10.1038/nature0396810.1038/nature03968 ↗
40. 10.1016/j.jmmm.2008.12.01310.1016/j.jmmm.2008.12.013 ↗
41. 10.1021/cm049221k10.1021/cm049221k ↗
42. 10.1016/j.materresbull.2008.11.01810.1016/j.materresbull.2008.11.018 ↗
43. 10.1002/adma.20050146410.1002/adma.200501464 ↗
44. 10.1021/ja051669e10.1021/ja051669e ↗
45. 10.1016/j.susc.2008.09.06810.1016/j.susc.2008.09.068 ↗
46. 10.1088/0957-4484/21/8/08570710.1088/0957-4484/21/8/085707 ↗
47. 10.1109/20.95112610.1109/20.951126 ↗
48. 10.1080/1061027080254604410.1080/10610270802546044 ↗
49. 10.1038/nnano.2009.8110.1038/nnano.2009.81 ↗
50. 10.1002/adma.20040159310.1002/adma.200401593 ↗
51. 10.1038/nature0170210.1038/nature01702 ↗
52. 10.1021/jp003952010.1021/jp0039520 ↗
53. L. T. Schelhas, R. A. Farrell, U. Halim, and S. H. Tolbert, “Directed self-assembly as a route to ferromagnetic and superparamagnetic nanoparticle arrays,” Adv. Func. Mater. (in press).
54. 10.1126/science.279.5350.54810.1126/science.279.5350.548 ↗
55. 10.1038/378366a010.1038/378366a0 ↗
56. 10.1021/ja00053a02010.1021/ja00053a020 ↗
57. 10.1038/368317a010.1038/368317a0 ↗
58. 10.1039/b820539f10.1039/b820539f ↗
59. 10.1021/cm801273310.1021/cm8012733 ↗
60. 10.1021/cm000164e10.1021/cm000164e ↗
61. 10.1021/ja974025i10.1021/ja974025i ↗
62. S. Angloher and T. Bein, “Organic functionalisation of mesoporous silica,” Stud. Surf. Sci. Catal. 158, 2017–2026 (2005).10.1016/S0167-2991(05)80568-3 ↗
63. 10.1021/la035842110.1021/la0358421 ↗
64. 10.1002/(SICI)1521-4095(200003)12:6<430::AID-ADMA430>3.0.CO;2-310.1002/(SICI)1521-4095(200003)12:6<430::AID-ADMA430>3.0.CO;2-3 ↗
65. 10.1038/359710a010.1038/359710a0 ↗
66. 10.1002/adma.20060136710.1002/adma.200601367 ↗
67. 10.1021/jp010174i10.1021/jp010174i ↗
68. 10.1021/cm991048i10.1021/cm991048i ↗
69. 10.1016/S0920-5861(01)00282-610.1016/S0920-5861(01)00282-6 ↗
70. See supplementary material at http://dx.doi.org/10.1063/1.4897964 E-AMPADS-2-009493 for fully synthetic details, X-ray powder diffraction data on the mesoporous silica host, and on fcc and fct FePt nanocrystals, fully details on instrumentation used in this work and the 10 K and 298 K hysteresis curves used to determine these coercivity values.
71. 10.1021/ja047648m10.1021/ja047648m ↗
72. 10.1103/PhysRev.70.96510.1103/PhysRev.70.965 ↗
73. L. Néel, “Théorie du traînage magnétique des ferromagnétiques en grains fins avec application aux terres,” Ann. Geophys. 5, 99–136 (1949).
74. 10.1103/PhysRevB.65.13442610.1103/PhysRevB.65.134426 ↗
75. 10.1147/rd.491.007910.1147/rd.491.0079 ↗
76. 10.1016/j.jmmm.2006.01.02810.1016/j.jmmm.2006.01.028 ↗
77. 10.1002/1521-4095(200108)13:15<1158::AID-ADMA1158>3.0.CO;2-610.1002/1521-4095(200108)13:15<1158::AID-ADMA1158>3.0.CO;2-6 ↗
78. 10.1103/PhysRevB.66.06040310.1103/PhysRevB.66.060403 ↗
79. 10.1021/nn700121310.1021/nn7001213 ↗
80. N. A. Spaldin, “Anisotropy,” in Magnetic Materials: Fundamentals and Device Applications (Cambridge University Press, 2003), Chap. 10, pp. 123–131.
81. 10.1103/PhysRevLett.78.179110.1103/PhysRevLett.78.1791 ↗
82. 10.1039/c0jm04014b10.1039/c0jm04014b ↗
83. 10.1021/ja908481z10.1021/ja908481z ↗
84. 10.1038/nature0441410.1038/nature04414 ↗
85. 10.1021/nl070058c10.1021/nl070058c ↗