Permanent magnet design assisted by antiferromagnet-ferromagnet interface coupling: A Monte Carlo study
Source abstract
Abstract
Abstract In the pursuit of rare-earth-free permanent magnets, materials with large saturation magnetization ( M s ) stand out. However, large M s results in low anisotropy field, thus additional source of coercivity is needed to make useful magnets for a broad range of applications. In this paper, we investigate the use of interface coupling to an antiferromagnet (AFM) as a means to increase coercivity for permanent magnet design. Results on the effects of Neel temperature, AFM anisotropy, interface coupling strength, AFM volume ratio, as well as temperature dependence are obtained using Monte Carlo (MC) simulations. And before that, we clarify some practices in MC simulations of magnetic hysteresis. The origin of coercivity enhancement is investigated by examining the magnetization reversal process, which is found to agree with well-established theory of exchange bias. Finally, discussions and design suggestions are made on the AFM materials, the geometry, and experimental realization.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic properties of thin films · Characterization and Applications of Magnetic Nanoparticles · Magnetic Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (41)
Show source-provided references
1. New magnetic anisotropy10.1103/PhysRev.105.904 ↗
2. Orientational dependence of the exchange biasing in molecular-beam-epitaxy-grown Ni80Fe20/Fe50Mn50 bilayers (invited)10.1063/1.356888 ↗
3. Exchange bias10.1016/S0304-8853(98)00266-2 ↗
4. Mechanisms for exchange bias10.1088/0022-3727/33/23/201 ↗
5. Exchange bias in nanostructures10.1016/j.physrep.2005.08.004 ↗
6. Anisotropic exchange for NiFe films grown on epitaxial NiO10.1109/20.490068 ↗
7. Magnetic properties of NiFe films exchange-coupled with NiO10.1109/20.489871 ↗
8. Exploration of magnetization reversal and coercivity of epitaxial NiO 111/NiFe films10.1063/1.362007 ↗
9. Coercivity enhancement in exchange biased systems driven by interfacial magnetic frustration10.1103/PhysRevLett.84.3466 ↗
10. Thermal fluctuation aftereffect model for some systems with ferromagnetic-antiferromagnetic coupling10.1063/1.1660894 ↗
11. Simple model for thin ferromagnetic films exchange coupled to an antiferromagnetic substrate10.1063/1.339367 ↗
12. Consequences of spin-flop coupling in exchange biased films10.1103/PhysRevLett.81.4516 ↗
13. Coercivity in exchange-bias bilayers10.1103/PhysRevB.63.064405 ↗
14. Current progress and future challenges in rare-earth-free permanent magnets10.1016/j.actamat.2018.07.049 ↗
15. New magnetic material having ultrahigh magnetic moment10.1063/1.1654030 ↗
16. Giant magnetic moment and other magnetic properties of epitaxially grown Fe16N2 single-crystal films (invited)10.1063/1.350067 ↗
17. Fabrication of 16N2 films by sputtering process and experimental investigation of origin of giant saturation magnetization in 16N210.1109/TMAG.2011.2170156 ↗
18. Synthesis of 16N2 compound free-standing foils with 20 MGOe magnetic energy product by nitrogen ion-implantation10.1038/srep25436 ↗
19. Synthesis of α″-16N2 compound anisotropic magnet by the strained-wire method
20. Facile synthesis of single-phase spherical α″-16N2/Al2O3 core-shell nanoparticles via a gas-phase method10.1063/1.4798959 ↗
21. Effect of magnetic field strength on the alignment of α″-16N2 nanoparticle films10.1039/C5NR07859H ↗
22. Synthesis, morphology, thermal stability and magnetic properties of α″-16N2 nanoparticles obtained by hydrogen reduction of γ-Fe2O3 and subsequent nitrogenation10.1016/j.actamat.2016.10.061 ↗
23. Fe16N2–from a 40-year mystery of magnetic materials to one of promises for rare-earth-free magnets (invited talk)
24. Room-temperature coercivity enhancement in mechanically alloyed antiferromagnetic-ferromagnetic powders10.1063/1.125269 ↗
25. Coercivity and squareness enhancement in ball-milled hard magnetic-antiferromagnetic composites10.1063/1.1392308 ↗
26. Improving the energy product of hard magnetic materials10.1103/PhysRevB.65.174420 ↗
27. Strongly exchange coupled core—shell nanoparticles with high magnetic anisotropy: a strategy toward rare-earth-free permanent magnets10.1021/acs.chemmater.6b00623 ↗
28. Modeling of hysteresis loops by Monte Carlo simulation10.1063/1.4938549 ↗
29. Domain state model for exchange bias. I. theory10.1103/PhysRevB.66.014430 ↗
30. Monte Carlo simulations of exchange bias of ferromagnetic thin films on FeF2(110)10.1103/PhysRevB.70.184422 ↗
31. Numerical study of the exchange bias effects in magnetic nanoparticles with core/shell morphology10.1103/PhysRevB.71.134406 ↗
32. Epitaxial Fe16N2 thin film on nonmagnetic seed layer10.1063/1.5028396 ↗
33. Heavy-metal-free, low-damping, and non-interface perpendicular 16N2 thin film and magnetoresistance device10.1002/pssr.201900089 ↗
34. Monte carlo simulation with time step quantification in terms of langevin dynamics10.1103/PhysRevLett.84.163 ↗
35. Equation of state calculations by fast computing machines10.1063/1.1699114 ↗
36. Introduction to Markov Chain
37. Binder · 2010
38. Exchange bias in a magnetic ordered/disordered nanoparticle system: a Monte Carlo simulation study10.1016/j.jmmm.2007.02.035 ↗
39. Crystalline and magnetic anisotropy of the 3d-transition metal monoxides MnO, FeO, CoO, and NiO10.1103/PhysRevB.86.115134 ↗
40. Large exchange bias in polycrystalline MnN/CoFe bilayers at room temperature10.1103/PhysRevB.92.144408 ↗
41. Measurement of the anisotropy constant of antiferromagnets in metallic polycrystalline exchange biased systems10.1063/1.2817230 ↗