We report the results of investigations of the effect of cooling in an external magnetic field starting from the temperature over superparamagnetic blocking temperature TB on the shift of magnetic hysteresis loops in systems of ferrihydrite nanoparticles from ∼2.5 to ∼5 nm in size with different TB values. In virtue of high anisotropy fields of ferrihydrite nanoparticles and open hysteresis loops in the range of experimentally attainable magnetic fields, the shape of hysteresis loops of such objects in the field-cooling mode is influenced by the minor hysteresis loop effect. A technique is proposed for distinguishing the exchange bias effect among the effects related to the minor hysteresis loops caused by high anisotropy fields of ferrihydrite particles. The exchange bias in ferrihydrite is stably observed for particles not less than 3 nm in size or with TB over 40 K, and its characteristic value increases with the particle size.
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14 November 2016
Research Article|
November 14 2016
Exchange bias in nano-ferrihydrite
D. A. Balaev;
D. A. Balaev
1Kirensky Institute of Physics,
Russian Academy of Sciences
, Siberian Branch, Krasnoyarsk 660036, Russia
2
Siberian Federal University
, Krasnoyarsk 660041, Russia
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A. A. Krasikov;
A. A. Krasikov
a)
1Kirensky Institute of Physics,
Russian Academy of Sciences
, Siberian Branch, Krasnoyarsk 660036, Russia
2
Siberian Federal University
, Krasnoyarsk 660041, Russia
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A. A. Dubrovskiy;
A. A. Dubrovskiy
1Kirensky Institute of Physics,
Russian Academy of Sciences
, Siberian Branch, Krasnoyarsk 660036, Russia
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S. I. Popkov
;
S. I. Popkov
1Kirensky Institute of Physics,
Russian Academy of Sciences
, Siberian Branch, Krasnoyarsk 660036, Russia
2
Siberian Federal University
, Krasnoyarsk 660041, Russia
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S. V. Stolyar;
S. V. Stolyar
1Kirensky Institute of Physics,
Russian Academy of Sciences
, Siberian Branch, Krasnoyarsk 660036, Russia
2
Siberian Federal University
, Krasnoyarsk 660041, Russia
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R. S. Iskhakov;
R. S. Iskhakov
1Kirensky Institute of Physics,
Russian Academy of Sciences
, Siberian Branch, Krasnoyarsk 660036, Russia
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V. P. Ladygina;
V. P. Ladygina
3Presidium of Krasnoyarsk Scientific Center,
Russian Academy of Sciences
, Siberian Branch, Krasnoyarsk 660036, Russia
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R. N. Yaroslavtsev
R. N. Yaroslavtsev
2
Siberian Federal University
, Krasnoyarsk 660041, Russia
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
J. Appl. Phys. 120, 183903 (2016)
Article history
Received:
June 27 2016
Accepted:
November 03 2016
Citation
D. A. Balaev, A. A. Krasikov, A. A. Dubrovskiy, S. I. Popkov, S. V. Stolyar, R. S. Iskhakov, V. P. Ladygina, R. N. Yaroslavtsev; Exchange bias in nano-ferrihydrite. J. Appl. Phys. 14 November 2016; 120 (18): 183903. https://doi.org/10.1063/1.4967912
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