Large exchange bias with remarkable thermostability in an inverted quasi core/shell CoO/γ-Fe2O3 granular system
Source abstract
Abstract
An inverted quasi core/shell CoO/γ-Fe2O3 granular system was synthesized through two-step thermal decomposition of acetylacetonate salt. A large exchange bias (EB) effect with remarkable thermostability was found in this granular system. The EB field revealed a large value about 8 kOe at 5 K. A temperature independent-like plateau feature from 75 to 200 K and a high-blocking temperature of EB about 280 K were observed, indicating a remarkable thermostability of EB. Both horizontal and vertical shifts observed in this system could be tuned by the temperature and the cooling field. The linear relation between EB field and pinned uncompensated spins indicated that the uncompensated spins at the interface between CoO and γ-Fe2O3 played an important role in the observed EB effect.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic properties of thin films · Iron oxide chemistry and applications · Magnetic Properties and Synthesis of Ferrites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (54)
Show source-provided references
1. Béa H, Bibes M, Ott F, Dupé B, Zhu XH, Petit S, Fusil S, Deranlot C, Bouzehouane K, Barthélémy A (2008) Mechanisms of exchange bias with multiferroic BiFeO3 epitaxial thin films. Phys Rev Lett 100(1):01720410.1103/PhysRevLett.100.017204 ↗
2. Berkowitz AE, Takano K (1999) Exchange anisotropy—a review. J Magn Magn Mater 200(1–3):552–57010.1016/S0304-8853(99)00453-9 ↗
3. Berkowitz AE, Rodriguez GF, Hong JI, An K, Hyeon T, Agarwal N, Smith DJ, Fullerton EE (2008) Antiferromagnetic MnO nanoparticles with ferrimagnetic Mn3O4 shells: doubly inverted core-shell system. Phys Rev B 77(2):02440310.1103/PhysRevB.77.024403 ↗
4. Cabot A, Alivisatos AP, Puntes VF, Balcells L, Iglesias Ò, Labarta A (2009) Magnetic domains and surface effects in hollow maghemite nanoparticles. Phys Rev B 79(9):09441910.1103/PhysRevB.79.094419 ↗
5. Chandra S, Khurshid H, Li W, Hadjipanayis GC, Phan MH, Srikanth H (2012a) Spin dynamics and criteria for onset of exchange bias in superspin glass Fe/γ-Fe2O3 core-shell nanoparticles. Phys Rev B 86(1):01442610.1103/PhysRevB.86.014426 ↗
6. Chandra S, Khurshid H, Phan M-H, Srikanth H (2012b) Asymmetric hysteresis loops and its dependence on magnetic anisotropy in exchange biased Co/CoO core-shell nanoparticles. Appl Phys Lett 101(23):23240510.1063/1.4769350 ↗
7. Chen C-J, Chiang R-K, Lai H-Y, Lin C-R (2010) Characterization of monodisperse wüstite nanoparticles following partial oxidation. J Phys Chem C 114(10):4258–426310.1021/jp908153y ↗
8. De Toro JA, Andrés JP, González JA, Muñiz P, Muñoz T, Normile PS, Riveiro JM (2006) Exchange bias and nanoparticle magnetic stability in Co–CoO composites. Phys Rev B 73(9):09444910.1103/PhysRevB.73.094449 ↗
9. Del Bianco L, Fiorani D, Testa AM, Bonetti E, Signorini L (2004) Field-cooling dependence of exchange bias in a granular system of Fe nanoparticles embedded in an Fe oxide matrix. Phys Rev B 70(5):05240110.1103/PhysRevB.70.052401 ↗
10. El-Sheikh S, Rashad M, Harraz F (2013) Morphological investigation and magnetic properties of nickel zinc ferrite 1D nanostructures synthesized via thermal decomposition method. J Nanopart Res 15(10):1–1110.1007/s11051-013-1967-9 ↗
11. Evans RFL, Bate D, Chantrell RW, Yanes R, Chubykalo-Fesenko O (2011) Influence of interfacial roughness on exchange bias in core-shell nanoparticles. Phys Rev B 84(9):09240410.1103/PhysRevB.84.092404 ↗
12. Feygenson M, Yiu Y, Kou A, Kim K-S, Aronson MC (2010) Controlling the exchange bias field in Co core/CoO shell nanoparticles. Phys Rev B 81(19):19544510.1103/PhysRevB.81.195445 ↗
13. Hai HT, Kura H, Takahashi M, Ogawa T (2011) High thermal stability of the ferrimagnetic moment in exchange biased FeO(core)/spinel(shell) nanocubes. J Phys Conf Ser 266(1):01212710.1088/1742-6596/266/1/012127 ↗
14. Hai-Tao Z, Xian-Hui C (2005) Controlled synthesis and anomalous magnetic properties of relatively monodisperse CoO nanocrystals. Nanotechnology 16(10):228810.1088/0957-4484/16/10/051 ↗
15. Hochstrat A, Binek C, Kleemann W (2002) Training of the exchange-bias effect in NiO–Fe heterostructures. Phys Rev B 66(9):09240910.1103/PhysRevB.66.092409 ↗
16. Huang XH, Ding JF, Zhang GQ, Hou Y, Yao YP, Li XG (2008) Size-dependent exchange bias in La0.25Ca0.75MnO3 nanoparticles. Phys Rev B 78(22):22440810.1103/PhysRevB.78.224408 ↗
17. Inderhees SE, Borchers JA, Green KS, Kim MS, Sun K, Strycker GL, Aronson MC (2008) Manipulating the magnetic structure of Co Core/CoO shell nanoparticles: implications for controlling the exchange bias. Phys Rev Lett 101(11):11720210.1103/PhysRevLett.101.117202 ↗
18. Kavich DW, Dickerson JH, Mahajan SV, Hasan SA, Park JH (2008) Exchange bias of singly inverted FeO/Fe3O4 core-shell nanocrystals. Phys Rev B 78(17):17441410.1103/PhysRevB.78.174414 ↗
19. Keller J, Miltényi P, Beschoten B, Güntherodt G, Nowak U, Usadel KD (2002) Domain state model for exchange bias. II. Experiments. Phys Rev B 66(1):01443110.1103/PhysRevB.66.014431 ↗
20. Khurshid H, Chandra S, Li W, Phan MH, Hadjipanayis GC, Mukherjee P, Srikanth H (2013) Synthesis and magnetic properties of core/shell FeO/Fe3O4 nano-octopods. J Appl Phys 113(17):17B50810.1063/1.4794978 ↗
21. Kumar P (2010) Magnetic behavior of surface nanostructured 50 nm nickel thin films. Nanoscale Res Lett 5(10):1596–160210.1007/s11671-010-9682-2 ↗
22. Kumar P, Ghanashyam Krishna M, Bhattacharya AK (2009) Effect of microstructural evolution on magnetic properties of Ni thin films. Bull Mater Sci 32(3):263–27010.1007/s12034-009-0040-x ↗
23. Laureti S, Suck SY, Haas H, Prestat E, Bourgeois O, Givord D (2012) Size dependence of exchange bias in Co/CoO nanostructures. Phys Rev Lett 108(7):07720510.1103/PhysRevLett.108.077205 ↗
24. Leighton C, Nogués J, Suhl H, Schuller IK (1999) Competing interfacial exchange and Zeeman energies in exchange biased bilayers. Phys Rev B 60(18):12837–1284010.1103/PhysRevB.60.12837 ↗
25. Leighton C, Nogués J, Jönsson-Åkerman BJ, Schuller IK (2000) Coercivity enhancement in exchange biased systems driven by interfacial magnetic frustration. Phys Rev Lett 84(15):3466–346910.1103/PhysRevLett.84.3466 ↗
26. López-Ortega A, Tobia D, Winkler E, Golosovsky IV, Salazar-Alvarez G, Estradé S, Estrader M, Sort J, González MA, Suriñach S, Arbiol J, Peiró F, Zysler RD, Baró MD, Nogués J (2010) Size-dependent passivation shell and magnetic properties in antiferromagnetic/ferrimagnetic core/shell MnO nanoparticles. J Am Chem Soc 132(27):9398–940710.1021/ja1021798 ↗
27. Martínez B, Obradors X, Balcells L, Rouanet A, Monty C (1998) Low temperature surface spin-glass transition in γ-Fe2O3 nanoparticles. Phys Rev Lett 80(1):181–18410.1103/PhysRevLett.80.181 ↗
28. Meiklejohn WH, Bean CP (1956) New magnetic anisotropy. Phys Rev 102(5):1413–141410.1103/PhysRev.102.1413 ↗
29. Miroslavna K, Montserrat García del M, Zorica K, Manuel V, Òscar I, Amílcar L, Xavier B (2009) Controlling exchange bias in Co–CoO x nanoparticles by oxygen content. Nanotechnology 20(17):17570210.1088/0957-4484/20/17/175702 ↗
30. Moran TJ, Schuller IK (1996) Effects of cooling field strength on exchange anisotropy at permalloy/CoO interfaces. J Appl Phys 79(8):5109–511110.1063/1.361317 ↗
31. Nogués J, Schuller IK (1999) Exchange bias. J Magn Magn Mater 192(2):203–23210.1016/S0304-8853(98)00266-2 ↗
32. Nogués J, Lederman D, Moran TJ, Schuller IK (1996) Positive exchange bias in FeF2–Fe bilayers. Phys Rev Lett 76(24):4624–462710.1103/PhysRevLett.76.4624 ↗
33. Nogués J, Leighton C, Schuller IK (2000) Correlation between antiferromagnetic interface coupling and positive exchange bias. Phys Rev B 61(2):1315–131710.1103/PhysRevB.61.1315 ↗
34. Nogués J, Sort J, Langlais V, Skumryev V, Suriñach S, Muñoz JS, Baró MD (2005) Exchange bias in nanostructures. Phys Rep 422(3):65–11710.1016/j.physrep.2005.08.004 ↗
35. Ohldag H, Scholl A, Nolting F, Arenholz E, Maat S, Young AT, Carey M, Stöhr J (2003) Correlation between exchange bias and pinned interfacial spins. Phys Rev Lett 91(1):01720310.1103/PhysRevLett.91.017203 ↗
36. Ong QK, Wei A, Lin X-M (2009) Exchange bias in Fe/Fe3O4 core-shell magnetic nanoparticles mediated by frozen interfacial spins. Phys Rev B 80(13):13441810.1103/PhysRevB.80.134418 ↗
37. Panagiotopoulos I, Basina G, Alexandrakis V, Devlin E, Hadjipanayis G, Colak L, Niarchos D, Tzitzios V (2009) Synthesis and exchange Bias in γ-Fe2O3/CoO and reverse CoO/γ-Fe2O3 binary nanoparticles. J Phys Chem C 113(33):14609–1461410.1021/jp8085446 ↗
38. Peng DL, Sumiyama K, Hihara T, Yamamuro S, Konno TJ (2000) Magnetic properties of monodispersed Co/CoO clusters. Phys Rev B 61(4):3103–310910.1103/PhysRevB.61.3103 ↗
39. Pereira C, Pereira AM, Quaresma P, Tavares PB, Pereira E, Araujo JP, Freire C (2010) Superparamagnetic γ-Fe2O3@SiO2 nanoparticles: a novel support for the immobilization of [VO(acac)2]. Dalton Trans 39(11):2842–285410.1039/b920853d ↗
40. Punnoose A, Seehra MS (2002) Hysteresis anomalies and exchange bias in 6.6 nm CuO nanoparticles. J Appl Phys 91(10):7766–776810.1063/1.1447182 ↗
41. Salazar-Alvarez G, Sort J, Suriñach S, Baró MD, Nogués J (2007) Synthesis and size-dependent exchange bias in inverted core−shell MnO|Mn3O4 nanoparticles. J Am Chem Soc 129(29):9102–910810.1021/ja0714282 ↗
42. Simeonidis K, Martinez-Boubeta C, Iglesias O, Cabot A, Angelakeris M, Mourdikoudis S, Tsiaoussis I, Delimitis A, Dendrinou-Samara C, Kalogirou O (2011) Morphology influence on nanoscale magnetism of Co nanoparticles: experimental and theoretical aspects of exchange bias. Phys Rev B 84(14):14443010.1103/PhysRevB.84.144430 ↗
43. Skumryev V, Stoyanov S, Zhang Y, Hadjipanayis G, Givord D, Nogues J (2003) Beating the superparamagnetic limit with exchange bias. Nature 423(6942):850–85310.1038/nature01687 ↗
44. Sun X, Frey Huls N, Sigdel A, Sun S (2011) Tuning exchange bias in core/shell FeO/Fe3O4 nanoparticles. Nano Lett 12(1):246–25110.1021/nl2034514 ↗
45. Takano K, Kodama RH, Berkowitz AE, Cao W, Thomas G (1997) Interfacial uncompensated antiferromagnetic spins: role in unidirectional anisotropy in polycrystalline Ni81F19/CoO bilayers. Phys Rev Lett 79(6):1130–113310.1103/PhysRevLett.79.1130 ↗
46. Tang YJ, Smith DJ, Zink BL, Hellman F, Berkowitz AE (2003) Finite size effects on the moment and ordering temperature in antiferromagnetic CoO layers. Phys Rev B 67(5):05440810.1103/PhysRevB.67.054408 ↗
47. Tang Y-K, Sun Y, Cheng Z-H (2006) Cooling field dependence of exchange bias in phase-separated La0.88Sr0.12CoO3. J Appl Phys 100(2):02391410.1063/1.2216819 ↗
48. Thakur M, Patra M, Majumdar S, Giri S (2009) Influence of cooling field on the magnetic properties of Ni/NiO nanostructure. J Alloys Compd 480(2):193–19710.1016/j.jallcom.2009.01.128 ↗
49. Tian ZM, Yuan SL, Yin SY, Liu L, He JH, Duan HN, Li P, Wang CH (2008) Exchange bias effect in a granular system of NiFe2O4 nanoparticles embedded in an antiferromagnetic NiO matrix. Appl Phys Lett 93(22):22250510.1063/1.3041640 ↗
50. Tracy JB, Weiss DN, Dinega DP, Bawendi MG (2005) Exchange biasing and magnetic properties of partially and fully oxidized colloidal cobalt nanoparticles. Phys Rev B 72(6):06440410.1103/PhysRevB.72.064404 ↗
51. Vázquez-Vázquez C, López-Quintela MA, Buján-Núñez MC, Rivas J (2011) Finite size and surface effects on the magnetic properties of cobalt ferrite nanoparticles. J Nanopart Res 13(4):1663–167610.1007/s11051-010-9920-7 ↗
52. Zhang D, Liu Z, Han S, Li C, Lei B, Stewart MP, Tour JM, Zhou C (2004) Magnetite (Fe3O4) core–shell nanowires: synthesis and magnetoresistance. Nano Lett 4(11):2151–215510.1021/nl048758u ↗
53. Zheng RK, Wen GH, Fung KK, Zhang XX (2004a) Giant exchange bias and the vertical shifts of hysteresis loops in γ-Fe2O3-coated Fe nanoparticles. J Appl Phys 95(9):5244–524610.1063/1.1687987 ↗
54. Zheng RK, Wen GH, Fung KK, Zhang XX (2004b) Training effect of exchange bias in γ-Fe2O3 coated Fe nanoparticles. Phys Rev B 69(21):21443110.1103/PhysRevB.69.214431 ↗