TY - JOUR
T1 - Spontaneous distortion via the appearance of ferromagnetism in Pd ultrathin films
T2 - Observation of an inverse mechanism for the Stoner criterion
AU - Sakuragi, Shunsuke
AU - Tajiri, Hiroo
AU - Kageshima, Hiroyuki
AU - Sato, Tetsuya
N1 - Funding Information:
We thank Y. Watanabe for technical support with respect to the x-ray diffraction measurements and R. Itotani, S. Urasaki, and K. Okada for fruitful advice on theoretical calculation. We also would like to thank to T. Ono, T. Hirahara, T. Hitosugi, R. Shimizu, M. Matsubara, K. Kuroda, and T. Kondo for valuable discussions. The synchrotron radiation experiments were performed at the BL13XU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposals No. 2014A1675, No. 2015A1775, No. 2015B1689). The computation in this work was done using the facilities of the Supercomputer Center, the Institute for Solid State Physics, the University of Tokyo. This work was supported by Japan Society for the Promotion of Science (JSPS) Grants-in-Aid for Scientific Research (KAKENHI) Grants No. 15J00298 and No. 15H01998. One of the authors (S.S.) also acknowledges a fellowship from the JSPS.
Funding Information:
The synchrotron radiation experiments were performed at the BL13XU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposals No. 2014A1675, No. 2015A1775, No. 2015B1689). The computation in this work was done using the facilities of the Supercomputer Center, the Institute for Solid State Physics, the University of Tokyo. This work was supported by Japan Society for the Promotion of Science (JSPS) Grants-in-Aid for Scientific Research (KAKENHI) Grants No. 15J00298 and No. 15H01998. One of the authors (S.S.) also acknowledges a fellowship from the JSPS.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/6/18
Y1 - 2018/6/18
N2 - We study the crystal structure of Pd(100) ultrathin films, which show ferromagnetism induced by the quantum confinement effect, using in situ x-ray crystal truncation rod measurement and density functional calculation. The energy gain from the appearance of ferromagnetism in Pd results in flatter and uniform film growth of ferromagnetic Pd films compared with paramagnetic Pd. In addition, ferromagnetic Pd films expand the out-of-plane lattice constant to suppress the increase in kinetic energy of electrons accompanied by the occurrence of exchange splitting. Although the traditional theory of magnetism in metals indicates that the increase in density of states induces ferromagnetism (Stoner criterion), our present finding reveals a mechanism of modulation in the density of states via the appearance of ferromagnetism, i.e., the inverse mechanism of Stoner's theory.
AB - We study the crystal structure of Pd(100) ultrathin films, which show ferromagnetism induced by the quantum confinement effect, using in situ x-ray crystal truncation rod measurement and density functional calculation. The energy gain from the appearance of ferromagnetism in Pd results in flatter and uniform film growth of ferromagnetic Pd films compared with paramagnetic Pd. In addition, ferromagnetic Pd films expand the out-of-plane lattice constant to suppress the increase in kinetic energy of electrons accompanied by the occurrence of exchange splitting. Although the traditional theory of magnetism in metals indicates that the increase in density of states induces ferromagnetism (Stoner criterion), our present finding reveals a mechanism of modulation in the density of states via the appearance of ferromagnetism, i.e., the inverse mechanism of Stoner's theory.
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U2 - 10.1103/PhysRevB.97.214421
DO - 10.1103/PhysRevB.97.214421
M3 - Article
AN - SCOPUS:85049049720
SN - 2469-9950
VL - 97
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
IS - 21
M1 - 214421
ER -