Large coercivity and low-temperature magnetic reorientation in ε-Fe <inf>2</inf>O <inf>3</inf> nanoparticles

M. Gich; A. Roig; C. Frontera; E. Molins; J. Sort; M. Popovici; G. Chouteau; D. Martín y Marero; J. Nogús

doi:https://doi.org/10.1063/1.1997297

Large coercivity and low-temperature magnetic reorientation in ε-Fe <inf>2</inf>O <inf>3</inf> nanoparticles

M. Gich, A. Roig, C. Frontera, E. Molins, J. Sort, M. Popovici, G. Chouteau, D. Martín y Marero, J. Nogús

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Abstract

A large coercive field, HC =20 kOe, is obtained at room temperature in ε- Fe2 O3 nanoparticles embedded in a silica matrix, produced by sol-gel chemistry. The combination of a relatively high magnetic anisotropy together with the small saturation magnetization are responsible for this large HC. Upon cooling, a strong reduction of HC is observed at T∼100 K, which is accompanied by a drastic reduction of the squareness ratio MR MS. Neutron-diffraction measurements reveal the existence of a low-temperature magnetic transition to which the softening of this material can be ascribed. © 2005 American Institute of Physics.

Original language	English
Article number	044307
Journal	Journal of Applied Physics
Volume	98
DOIs	https://doi.org/10.1063/1.1997297
Publication status	Published - 15 Aug 2005

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@article{65cfad5e156a43a1b1ee809f2d0ececc,

title = "Large coercivity and low-temperature magnetic reorientation in ε-Fe 2O 3 nanoparticles",

abstract = "A large coercive field, HC =20 kOe, is obtained at room temperature in ε- Fe2 O3 nanoparticles embedded in a silica matrix, produced by sol-gel chemistry. The combination of a relatively high magnetic anisotropy together with the small saturation magnetization are responsible for this large HC. Upon cooling, a strong reduction of HC is observed at T∼100 K, which is accompanied by a drastic reduction of the squareness ratio MR MS. Neutron-diffraction measurements reveal the existence of a low-temperature magnetic transition to which the softening of this material can be ascribed. {\textcopyright} 2005 American Institute of Physics.",

author = "M. Gich and A. Roig and C. Frontera and E. Molins and J. Sort and M. Popovici and G. Chouteau and {Mart{\'i}n y Marero}, D. and J. Nog{\'u}s",

year = "2005",

month = aug,

day = "15",

doi = "https://doi.org/10.1063/1.1997297",

language = "English",

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T1 - Large coercivity and low-temperature magnetic reorientation in ε-Fe 2O 3 nanoparticles

AU - Gich, M.

AU - Roig, A.

AU - Frontera, C.

AU - Molins, E.

AU - Sort, J.

AU - Popovici, M.

AU - Chouteau, G.

AU - Martín y Marero, D.

AU - Nogús, J.

PY - 2005/8/15

Y1 - 2005/8/15

N2 - A large coercive field, HC =20 kOe, is obtained at room temperature in ε- Fe2 O3 nanoparticles embedded in a silica matrix, produced by sol-gel chemistry. The combination of a relatively high magnetic anisotropy together with the small saturation magnetization are responsible for this large HC. Upon cooling, a strong reduction of HC is observed at T∼100 K, which is accompanied by a drastic reduction of the squareness ratio MR MS. Neutron-diffraction measurements reveal the existence of a low-temperature magnetic transition to which the softening of this material can be ascribed. © 2005 American Institute of Physics.

AB - A large coercive field, HC =20 kOe, is obtained at room temperature in ε- Fe2 O3 nanoparticles embedded in a silica matrix, produced by sol-gel chemistry. The combination of a relatively high magnetic anisotropy together with the small saturation magnetization are responsible for this large HC. Upon cooling, a strong reduction of HC is observed at T∼100 K, which is accompanied by a drastic reduction of the squareness ratio MR MS. Neutron-diffraction measurements reveal the existence of a low-temperature magnetic transition to which the softening of this material can be ascribed. © 2005 American Institute of Physics.

U2 - https://doi.org/10.1063/1.1997297

DO - https://doi.org/10.1063/1.1997297

M3 - Article

SN - 0021-8979

VL - 98

JO - Journal of Applied Physics

JF - Journal of Applied Physics

M1 - 044307

ER -

Large coercivity and low-temperature magnetic reorientation in ε-Fe <inf>2</inf>O <inf>3</inf> nanoparticles

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