Giant magnetic anisotropy and tunnelling of the magnetization in Li2(Li1-xFex)N

Jesche, A.; McCallum, R. W.; Thimmaiah, S.; Jacobs, J. L.; Taufour, V.; Kreyssig, A.; Houk, R. S.; Bud’ko, S. L.; Canfield, P. C.

doi:10.1038/ncomms4333

Title: Giant magnetic anisotropy and tunnelling of the magnetization in Li2(Li1-xFex)N

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Abstract

Large magnetic anisotropy and coercivity are key properties of functional magnetic materials and are generally associated with rare earth elements. Here we show an extreme, uniaxial magnetic anisotropy and the emergence of magnetic hysteresis in Li2(Li_1-xFe_x)N. An extrapolated, magnetic anisotropy field of 220 T and a coercivity field of over 11 T at 2 K outperform all known hard ferromagnets and single-molecular magnets. Steps in the hysteresis loops and relaxation phenomena in striking similarity to single-molecular magnets are particularly pronounced for x<<1 and indicate the presence of nanoscale magnetic centres. Quantum tunnelling, in the form of temperature-independent relaxation and coercivity, deviation from Arrhenius behaviour and blocking of the relaxation, dominates the magnetic properties up to 10 K. The simple crystal structure, the availability of large single crystals and the ability to vary the Fe concentration make Li2(Li_1-xFe_x)N an ideal model system to study macroscopic quantum effects at elevated temperatures and also a basis for novel functional magnetic materials.

Authors:: Jesche, A.; McCallum, R. W.; Thimmaiah, S.; Jacobs, J. L.; Taufour, V.; Kreyssig, A.; Houk, R. S.; Bud’ko, S. L.; Canfield, P. C.

Publication Date:: Tue Feb 25 00:00:00 EST 2014

Research Org.:: Ames Lab., Ames, IA (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1139968

Report Number(s):: IS-J 8280
Journal ID: ISSN 2041-1723

DOE Contract Number:: AC02-07CH11358

Resource Type:: Journal Article

Journal Name:: Nature Communications

Additional Journal Information:: Journal Volume: 5; Journal ID: ISSN 2041-1723

Publisher:: Nature Publishing Group

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; physical sciences; condensed matter; materials science

Citation Formats


                    Jesche, A., McCallum, R. W., Thimmaiah, S., Jacobs, J. L., Taufour, V., Kreyssig, A., Houk, R. S., Bud’ko, S. L., and Canfield, P. C. Giant magnetic anisotropy and tunnelling of the magnetization in Li2(Li1-xFex)N.  United States: N. p., 2014. 
        Web.  doi:10.1038/ncomms4333.

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                    Jesche, A., McCallum, R. W., Thimmaiah, S., Jacobs, J. L., Taufour, V., Kreyssig, A., Houk, R. S., Bud’ko, S. L., & Canfield, P. C. Giant magnetic anisotropy and tunnelling of the magnetization in Li2(Li1-xFex)N.  United States.  https://doi.org/10.1038/ncomms4333

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                    Jesche, A., McCallum, R. W., Thimmaiah, S., Jacobs, J. L., Taufour, V., Kreyssig, A., Houk, R. S., Bud’ko, S. L., and Canfield, P. C. 2014.  
        "Giant magnetic anisotropy and tunnelling of the magnetization in Li2(Li1-xFex)N".  United States.  https://doi.org/10.1038/ncomms4333.

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@article{osti_1139968,

  title        = {Giant magnetic anisotropy and tunnelling of the magnetization in Li2(Li1-xFex)N},

  author       = {Jesche, A. and McCallum, R. W. and Thimmaiah, S. and Jacobs, J. L. and Taufour, V. and Kreyssig, A. and Houk, R. S. and Bud’ko, S. L. and Canfield, P. C.},

  abstractNote = {Large magnetic anisotropy and coercivity are key properties of functional magnetic materials and are generally associated with rare earth elements. Here we show an extreme, uniaxial magnetic anisotropy and the emergence of magnetic hysteresis in Li2(Li1-xFex)N. An extrapolated, magnetic anisotropy field of 220 T and a coercivity field of over 11 T at 2 K outperform all known hard ferromagnets and single-molecular magnets. Steps in the hysteresis loops and relaxation phenomena in striking similarity to single-molecular magnets are particularly pronounced for x<<1 and indicate the presence of nanoscale magnetic centres. Quantum tunnelling, in the form of temperature-independent relaxation and coercivity, deviation from Arrhenius behaviour and blocking of the relaxation, dominates the magnetic properties up to 10 K. The simple crystal structure, the availability of large single crystals and the ability to vary the Fe concentration make Li2(Li1-xFex)N an ideal model system to study macroscopic quantum effects at elevated temperatures and also a basis for novel functional magnetic materials.},

  doi          = {10.1038/ncomms4333},

  url          = {https://www.osti.gov/biblio/1139968},
  journal      = {Nature Communications},

  issn         = {2041-1723},

  number       = ,

  volume       = 5,

  place        = {United States},

  year         = {Tue Feb 25 00:00:00 EST 2014},

  month        = {Tue Feb 25 00:00:00 EST 2014}

}

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