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Qualitative insight and quantitative analysis of the effect of temperature on the coercivity of a magnetic system
3.D. Goll, S. Macke, and H.N. Bertram, “Thermal reversal of exchange spring composite media in magnetic fields,” Appl. Phys. Lett. 90, 172506 (2007).
4.D. Suess, S. Eder, J. Lee, R. Dittrich, J. Fidler, J. W. Harrell, T. Schrefl, G. Hrkac, M. Schabes, N. Supper, and A. Berger, “Reliability of Sharrocks Equation for Exchange Spring Bilayers,” Phys. Rev. B 75, 174430 (2007).
5.D. Suess, L. Breth, J. Lee, M. Fuger, C. Vogler, F. Bruckner, B. Bergmair, T. Huber, J. Fidler, and T. Schrefl, “Calculation of Coercivity of Magnetic Nanostructures at Finite Temperatures,” Phys. Rev. B 84, 224421 (2011).
6.K. Maaz, A. Mumtaz, S.K. Hasanain, and M.F. Bertino, “Temperature dependent coercivity and magnetization of nickel ferrite nanoparticles,” J. Magn. Magn. Mater. 332, 2199 (2010).
8.P.M. Paulus, F. Luis, M. Kröll, G. Schmid, and L.J. de Jongh, “Low-temperature study of the magnetization reversal and magnetic anisotropy of Fe, Ni, and Co nanowires,” J. Magn. Magn. Mater. 224, 180 (2001).
10.J.J.M. Ruigrok, R. Coehoorn, S.R. Cumpson, and H.W. Kesteren, “Disk recording beyond 100 Gb/in.2: Hybrid recording?,” J. Appl. Phys. 87, 5398 (2000).
11.Jianhua Xue and R. H. Victora, “Micromagnetic predictions for thermally assisted reversal over long time scales,” Appl. Phys.Lett. 77, 3432 (2000).
12.O. Chubykalo-Fesenko and R.W. Chantrell, “Modeling of Long-Time Thermal Magnetization Decay in Interacting Granular Magnetic Materials,” IEEE Trans. Magn. 41, 3103 (2005).
13.O.A. Chubykalo, B. Lengsfield, B. Jones, J. Kaufman, J.M. Gonzalez, R.W. Chantrell, and R. Smirnov-Rueda, “Micromagnetic modelling of thermal decay in interacting systems,” J. Magn. Magn. Mater. 221, 132 (2000).
15.W.T. Coffey, D.A. Garanin, and D.J. McCarthy, “Crossover formulas in the Kramers theory of thermally activated escape rates - Application to spin systems,” Advances in Chemical Physics 117, 483 (2001).
16.R. Dittrich, T. Schrefl, D. Suess, W. Scholz, H. Forster, and J. Fidler, “A path method for finding energy barriers and minimum energy paths in complex micromagnetic systems,” J. Magn. Magn. Mater. 250, L12 (2002).
17.R. Dittrich, T. Schrefl, H. Forster, D. Suess, W. Scholz, and J. Fidler, “Energy Barriers in Magnetic Random Access Memory Elements,” IEEE Trans. on Magn. 39, 2839 (2003).
19.W. E, W. Ren, and E. Vanden-Eijnden, “Energy landscape and thermally activated switching of submicron-sized ferromagnetic elements,” J. Appl. Phys. 93, 2275 (2003).
20.R. Dittrich, T. Schrefl, A. Thiaville, J. Miltat, V. Tsiantos, and J. Fidler, “Comparison of Langevin dynamics and direct energy barrier computation,” J. Magn. Magn. Mater. 272-276, 747 (2004).
21.R. Dittrich, T. Schrefl, M. Kirschner, D. Suess, G. Hrkac, F. Dorfbauer, O. Ertl, and J. Fidler, “Thermally Induced Vortex Nucleation in Permalloy Elements,” IEEE Trans. on Magn. 41, 3592 (2005).
23.D.V. Berkov, “Magnetization Dynamics Including Thermal Fluctuations: Basic Phenomenology, Fast Remagnetization Processes and Transitions Over High-energy Barriers,” in Handbook of Magnetism and Advanced Magnetic Materials, edited byH. Kronmüller and S. Parkin., Vol. 2: Micromagnetism (JohnWiley & Sons, Ltd, Chichester, UK, 2007), p. 795.
24.P. Krone, D. Makarov, M. Albrecht, T. Schrefl, and D. Suess, “Magnetization reversal processes of single nanomagnets and their energy barrier,” J. Magn. Magn. Mater. 322, 3771 (2010).
26.G. Fiedler, J. Fidler, J. Lee, T. Schrefl, R.L. Stamps, H.B. Braun, and D. Suess, “Direct calculation of the attempt frequency of magnetic structures using the finite element method,” J. Appl. Phys. 111, 093917 (2012).
28.I. Tudosa, M.V. Lubarda, K.T. Chan, M.A. Escobar, V. Lomakin, and E.E. Fullerton, “Thermal stability of patterned Co/Pd nanodot arrays,” Appl. Phys. Lett. 100, 102401 (2012).
30.P.F. Bessarab, V.M. Uzdin, and H. Jónsson, “Calculations of magnetic states and minimum energy paths of transitions using a noncollinear extension of the Alexander-Anderson model and a magnetic force theorem,” Phys. Rev. B 89, 214424 (2014).
31.E.F. Kneller and R. Hawig, “The exchange-spring magnet: a new material principle for permanent magnets,” IEEE Trans. Magn. 27, 3588 (1991).
33.E. Goto, N. Hayashi, T. Miyashita, and K. Nakagawa, “Magnetization and Switching Characteristics of Composite Thin Magnetic Films,” J. Appl. Phys. 36, 2951 (1965).
34.K. Mibu, T. Nagahama, and T. Shinjo, “Reversible magnetization process and magnetoresistance of soft-magnetic (NiFe)/hard-magnetic (CoSm) bilayers,” J. Magn. Magn. Mater. 163, 75 (1996).
35.S. Wüchner, J. C. Toussaint, and J. Voiron, “Magnetic properties of exchange-coupled trilayers of amorphous rare-earth-cobalt alloys,” Phys. Rev. B 55, 11576 (1997).
36.J-U. Thiele, S. Maat, and E.E. Fullerton, “FeRh/FePt exchange spring films for thermally assisted magnetic recording media,” Appl. Phys. Letters 82, 2859 (2003).
37.E.E. Fullerton, J.S. Jiang, M. Grimsditch, C.H. Sowers, and S.D. Bader, “Exchange-spring behavior in epitaxial hard/soft magnetic bilayers,” Phys. Rev. B 58, 12193 (1998).
39.J.Y. Gu, J. Burgess, and C-Y. You, “Temperature dependence of magnetization reversal processes in exchange-spring magnets,” J. Appl. Phys. 107, 103918 (2010).
40.P.F. Bessarab, V.M. Uzdin, and H. Jónsson, “Potential energy surfaces and rates of spin transitions,” Zeitschrift für Physikalische Chemie 227, 1543 (2013).
41.P.F. Bessarab, V.M. Uzdin, and H. Jónsson, “Method for finding mechanism and activation energy of magnetic transitions, applied to skyrmion and antivortex annihilation,” Comput. Phys. Commun. 196, 335 (2015).
42.H. Jónsson, G. Mills, and K. W. Jacobsen, in Classical and Quantum Dynamics in Condensed Phase Simulations, edited by B. J. Berne, G. Ciccotti, and D. F. Coker (World Scientific, Singapore, 1998), p. 385.
47.H.B. Callen and E. Callen, “The Present Status of the Temperature Dependence of Magnetocrystalline Anisotropy, and the z(z+1)/2 Power Law,” J. Phys. Chem. Solids 27, 1271 (1966).
48.P. Asselin, R.F.L. Evans, J. Barker, R.W. Chantrell, R. Yanes, O. Chubykalo-Fesenko, D. Hinzke, and U. Nowak, “Constrained Monte Carlo method and calculation of the temperature dependence of magnetic anisotropy,” Phys. Rev. B 82, 054415 (2010).
50.J.S. Jiang, J.E. Pearson, Z.Y. Liu, B. Kabius, S. Trasobares, D.J. Miller, S.D. Bader, D.R. Lee, D. Haskel, G. Srajer, and J. P. Liu, “A new approach for improving exchange-spring magnets,” J. Appl. Phys. 97, 10K311 (2005).
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The temperature dependence of the response of a magnetic system to an applied field can be understood qualitatively by considering variations in the energy surface characterizing the system and estimated quantitatively with rate theory. In the system analysed here, Fe/Sm-Co spring magnet, the width of the hysteresis loop is reduced to a half when temperature is raised from 25 K to 300 K. This narrowing can be explained and reproduced quantitatively without invoking temperature dependence of model parameters as has typically been done in previous data analysis. The applied magnetic field lowers the energy barrier for reorientation of the magnetization but thermal activation brings the system over the barrier. A 2-dimensional representation of the energy surface is developed and used to gain insight into the transition mechanism and to demonstrate how the applied field alters the transition path. Our results show the importance of explicitly including the effect of thermal activation when interpreting experiments involving the manipulation of magnetic systems at finite temperature.
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