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Influence of thermal coupling on spin avalanches in Mn₁₂-acetate

Webster, C.H. , Kazakova, O., Gallop, J.C., Josephs-Franks, P.W., Hernandez-Minguez, A. and Tzalenchuk, A.Y. (2007) Influence of thermal coupling on spin avalanches in Mn₁₂-acetate. Physical Review B, 76(1), 012403. (doi: 10.1103/PhysRevB.76.012403)

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Abstract

The effect of thermal coupling on spin avalanches in Mn 12 -acetate has been probed using a single crystal assembly. Time-resolved, synchronized measurements of magnetization and temperature are reported. Unusually low avalanche trigger fields occur when thermal coupling to the bath is weak. A temperature rise observed at zero magnetic field is attributed to a change in magnetostatic energy.

Item Type:	Articles
Keywords:	Single molecule magnets, spin avalanches, macroscopic quantum tunnelling.
Status:	Published
Refereed:	Yes
Glasgow Author(s) Enlighten ID:	Webster, Dr Carol
Authors:	Webster, C.H., Kazakova, O., Gallop, J.C., Josephs-Franks, P.W., Hernandez-Minguez, A., and Tzalenchuk, A.Y.
College/School:	College of Science and Engineering > School of Computing Science
Journal Name:	Physical Review B
Publisher:	American Physical Society
ISSN:	1098-0121
ISSN (Online):	1550-235X
Published Online:	09 July 2007

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References

1 G. Christou, D. Gatteschi, D. N. Hendrickson, and R. Sessoli, MRS Bull. 25, 66 (2000). 2 J. R. Friedman, M. P. Sarachik, J. Tejada, and R. Ziolo, Phys. Rev. Lett. 76, 3830 (1996). 3 L. Thomas, F. Lionti, R. Ballou, D. Gatteschi, R. Sessoli, and B. Barbara, Nature (London) 383, 145 (1996). 4 C. Paulsen, J.-G. Park, B. Barbara, R. Sessoli, and A. Caneschi, J. Magn. Magn. Mater. 140–144, 1891 (1995). 5 J. A. A. J. Perenboom, J. S. Brooks, S. Hill, T. Hathaway, and N. S. Dalal, Phys. Rev. B 58, 330 (1998). 6 E. del Barco, J. M. Hernandez, M. Sales, J. Tejada, H. Rakoto, J. M. Broto, and E. M. Chudnovsky, Phys. Rev. B 60, 11898 (1999). 7 I. Chiorescu, R. Giraud, A. G. M. Jansen, A. Caneschi, and B. Barbara, Phys. Rev. Lett. 85, 4807 (2000). 8 Y. Suzuki, M. P. Sarachik, E. M. Chudnovsky, S. McHugh, R. Gonzalez-Rubio, N. Avraham, Y. Myasoedov, E. Zeldov, H. Sh- trikman, N. E. Chakov et al., Phys. Rev. Lett. 95, 147201 (2005). 9 Y. Suzuki, M. P. Sarachik, N. Avraham, Y. Myasoedov, H. Shtrik- man, E. Zeldov, E. M. Rumberger, D. N. Hendrickson, and G. Christou, J. Appl. Phys. 97, 10M517 (2005). 10 F. Fominaya, J. Villain, P. Gandit, J. Chaussy, and A. Caneschi, Phys. Rev. Lett. 79, 1126 (1997). 11 F. Fominaya, J. Villain, T. Fournier, P. Gandit, J. Chaussy, A. Fort, and A. Caneschi, Phys. Rev. B 59, 519 (1999). 12 T. Lis, Acta Crystallogr., Sect. B: Struct. Crystallogr. Cryst. Chem. B36, 2042 (1980). 13 Throughout this Brief Report, we use the symbol mu for the mag- netic moment of the sample and M for the magnetization (M = mu / V, where V is the sample volume). 14 J. Tejada, E. M. Chudnovsky, J. M. Hernandez, and R. Amigó, Appl. Phys. Lett. 84, 2373 (2004). 15 M. Bal, J. R. Friedman, K. Mertes, W. Chen, E. M. Rumberger, D. N. Hendrickson, N. Avraham, Y. Myasoedov, H. Shtrikman, and E. Zeldov, Phys. Rev. B 70, 140403(R) (2004). 16 The amplitude of the 50 Hz oscillation gets larger as the tempera- ture increases because the sensor resistance decreases by an or- der of magnitude between 1.6 and 4.3 K. This causes the ratio of pickup voltage to sensor voltage to decrease. 17 The sample volume V = 5.5 mm 3 was computed from the saturation moment mu S = 0.77 mJ T^−1 measured by SQUID magnetometry, using the known crystal structure and unit cell volume (Ref. 12) and the known spin S = 10 per molecule. 18 M. Evangelisti and J. Bartolomé, J. Magn. Magn. Mater. 221, 99 (2000). 19 In the case of the double peaks observed at the lowest trigger fields, only the first peak was fitted. 20 A. Hernandez-Minguez, J. M. Hernandez, F. Macià, A. García-Santiago, J. Tejada, and P. V. Santos, Phys. Rev. Lett. 95, 217205 (2005).

Deposit and Record Details

ID Code:	173816
Depositing User:	Dr Carol Webster
Datestamp:	21 Nov 2018 15:57
Last Modified:	22 Nov 2018 02:03
Date of acceptance:	9 July 2007
Date of first online publication:	9 July 2007

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Influence of thermal coupling on spin avalanches in Mn12-acetate

Abstract

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Influence of thermal coupling on spin avalanches in Mn₁₂-acetate