Thermomagnetic hysteresis effects in NiMn and NiMnPd thin films

Y. Öner, Chin-Shan Lue, Joseph H. Ross, K. D.D. Rathnayaka, D. G. Naugle

Research output: Contribution to journalConference article

11 Citations (Scopus)

Abstract

dc magnetization measurements, for zero-field cooled (MZFC) and field-cooled (MFC) cases, have been carried out for flash-evaporated Pd-doped NiMn thin films. These included reentrant phases (Ni76-xPdx)Mn24, for 0≤x≤5, and Ni75Mn23Pd2, a pure spinglass phase. The studies were performed over the temperature range 3-300 K. Low-field magnetization measurements show the irreversibility effect (MZFC and MFC diverge) at temperatures below the Curie temperature Tc. In Ni75Mn23Pd2, MZFC falls below MFC, as usually observed. However, in reentrant compositions, MZFC crosses MFC upon warming into the ferromagnetic regime, where it stays above MFC at temperatures below Tc. This unusual behavior is attributed to a model of Imry and Ma in which, in a ferromagnet with antiferromagnetic impurities, the impurities can couple to the host ferromagnetic alignment and force the system to break into domains antiferromagnetically coupled to each other. Field-cooled hysteresis measurements indicate the uniaxial anisotropy in these samples to be small, in contrast with the rigid uniaxial anisotropy reported for the corresponding polycrystalline bulk samples. Since the lattice-orbit coupling is weak in the amorphous phase, this clearly demonstrates that the physical origin of the unidirectional anisotropy is associated with the spin-orbit coupling.

Original languageEnglish
Pages (from-to)7044-7046
Number of pages3
JournalJournal of Applied Physics
Volume89
Issue number11 II
DOIs
Publication statusPublished - 2001 Jun 1
Event8th Joint Magnetism and Magnetic Materials-Intermag Conference - San Antonio, TX, United States
Duration: 2001 Jan 72001 Jan 11

Fingerprint

hysteresis
thin films
anisotropy
orbits
impurities
magnetization
guy wires
temperature
flash
Curie temperature
alignment
heating

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Öner, Y., Lue, C-S., Ross, J. H., Rathnayaka, K. D. D., & Naugle, D. G. (2001). Thermomagnetic hysteresis effects in NiMn and NiMnPd thin films. Journal of Applied Physics, 89(11 II), 7044-7046. https://doi.org/10.1063/1.1362650
Öner, Y. ; Lue, Chin-Shan ; Ross, Joseph H. ; Rathnayaka, K. D.D. ; Naugle, D. G. / Thermomagnetic hysteresis effects in NiMn and NiMnPd thin films. In: Journal of Applied Physics. 2001 ; Vol. 89, No. 11 II. pp. 7044-7046.
@article{ab729dc520114541a75d856b38725bea,
title = "Thermomagnetic hysteresis effects in NiMn and NiMnPd thin films",
abstract = "dc magnetization measurements, for zero-field cooled (MZFC) and field-cooled (MFC) cases, have been carried out for flash-evaporated Pd-doped NiMn thin films. These included reentrant phases (Ni76-xPdx)Mn24, for 0≤x≤5, and Ni75Mn23Pd2, a pure spinglass phase. The studies were performed over the temperature range 3-300 K. Low-field magnetization measurements show the irreversibility effect (MZFC and MFC diverge) at temperatures below the Curie temperature Tc. In Ni75Mn23Pd2, MZFC falls below MFC, as usually observed. However, in reentrant compositions, MZFC crosses MFC upon warming into the ferromagnetic regime, where it stays above MFC at temperatures below Tc. This unusual behavior is attributed to a model of Imry and Ma in which, in a ferromagnet with antiferromagnetic impurities, the impurities can couple to the host ferromagnetic alignment and force the system to break into domains antiferromagnetically coupled to each other. Field-cooled hysteresis measurements indicate the uniaxial anisotropy in these samples to be small, in contrast with the rigid uniaxial anisotropy reported for the corresponding polycrystalline bulk samples. Since the lattice-orbit coupling is weak in the amorphous phase, this clearly demonstrates that the physical origin of the unidirectional anisotropy is associated with the spin-orbit coupling.",
author = "Y. {\"O}ner and Chin-Shan Lue and Ross, {Joseph H.} and Rathnayaka, {K. D.D.} and Naugle, {D. G.}",
year = "2001",
month = "6",
day = "1",
doi = "10.1063/1.1362650",
language = "English",
volume = "89",
pages = "7044--7046",
journal = "Journal of Applied Physics",
issn = "0021-8979",
publisher = "American Institute of Physics Publising LLC",
number = "11 II",

}

Öner, Y, Lue, C-S, Ross, JH, Rathnayaka, KDD & Naugle, DG 2001, 'Thermomagnetic hysteresis effects in NiMn and NiMnPd thin films', Journal of Applied Physics, vol. 89, no. 11 II, pp. 7044-7046. https://doi.org/10.1063/1.1362650

Thermomagnetic hysteresis effects in NiMn and NiMnPd thin films. / Öner, Y.; Lue, Chin-Shan; Ross, Joseph H.; Rathnayaka, K. D.D.; Naugle, D. G.

In: Journal of Applied Physics, Vol. 89, No. 11 II, 01.06.2001, p. 7044-7046.

Research output: Contribution to journalConference article

TY - JOUR

T1 - Thermomagnetic hysteresis effects in NiMn and NiMnPd thin films

AU - Öner, Y.

AU - Lue, Chin-Shan

AU - Ross, Joseph H.

AU - Rathnayaka, K. D.D.

AU - Naugle, D. G.

PY - 2001/6/1

Y1 - 2001/6/1

N2 - dc magnetization measurements, for zero-field cooled (MZFC) and field-cooled (MFC) cases, have been carried out for flash-evaporated Pd-doped NiMn thin films. These included reentrant phases (Ni76-xPdx)Mn24, for 0≤x≤5, and Ni75Mn23Pd2, a pure spinglass phase. The studies were performed over the temperature range 3-300 K. Low-field magnetization measurements show the irreversibility effect (MZFC and MFC diverge) at temperatures below the Curie temperature Tc. In Ni75Mn23Pd2, MZFC falls below MFC, as usually observed. However, in reentrant compositions, MZFC crosses MFC upon warming into the ferromagnetic regime, where it stays above MFC at temperatures below Tc. This unusual behavior is attributed to a model of Imry and Ma in which, in a ferromagnet with antiferromagnetic impurities, the impurities can couple to the host ferromagnetic alignment and force the system to break into domains antiferromagnetically coupled to each other. Field-cooled hysteresis measurements indicate the uniaxial anisotropy in these samples to be small, in contrast with the rigid uniaxial anisotropy reported for the corresponding polycrystalline bulk samples. Since the lattice-orbit coupling is weak in the amorphous phase, this clearly demonstrates that the physical origin of the unidirectional anisotropy is associated with the spin-orbit coupling.

AB - dc magnetization measurements, for zero-field cooled (MZFC) and field-cooled (MFC) cases, have been carried out for flash-evaporated Pd-doped NiMn thin films. These included reentrant phases (Ni76-xPdx)Mn24, for 0≤x≤5, and Ni75Mn23Pd2, a pure spinglass phase. The studies were performed over the temperature range 3-300 K. Low-field magnetization measurements show the irreversibility effect (MZFC and MFC diverge) at temperatures below the Curie temperature Tc. In Ni75Mn23Pd2, MZFC falls below MFC, as usually observed. However, in reentrant compositions, MZFC crosses MFC upon warming into the ferromagnetic regime, where it stays above MFC at temperatures below Tc. This unusual behavior is attributed to a model of Imry and Ma in which, in a ferromagnet with antiferromagnetic impurities, the impurities can couple to the host ferromagnetic alignment and force the system to break into domains antiferromagnetically coupled to each other. Field-cooled hysteresis measurements indicate the uniaxial anisotropy in these samples to be small, in contrast with the rigid uniaxial anisotropy reported for the corresponding polycrystalline bulk samples. Since the lattice-orbit coupling is weak in the amorphous phase, this clearly demonstrates that the physical origin of the unidirectional anisotropy is associated with the spin-orbit coupling.

UR - http://www.scopus.com/inward/record.url?scp=0035356191&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035356191&partnerID=8YFLogxK

U2 - 10.1063/1.1362650

DO - 10.1063/1.1362650

M3 - Conference article

AN - SCOPUS:0035356191

VL - 89

SP - 7044

EP - 7046

JO - Journal of Applied Physics

JF - Journal of Applied Physics

SN - 0021-8979

IS - 11 II

ER -