Spontaneous distortion via the appearance of ferromagnetism in Pd ultrathin films: Observation of an inverse mechanism for the Stoner criterion

Shunsuke Sakuragi, Hiroo Tajiri, Hiroyuki Kageshima, Tetsuya Sato

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Article number214421
JournalPhysical Review B
Volume97
Issue number21
DOIs
Publication statusPublished - 2018 Jun 18

Fingerprint

Ultrathin films
Ferromagnetism
ferromagnetism
rocks
ferromagnetic films
Quantum confinement
Magnetism
Film growth
Kinetic energy
Lattice constants
Density functional theory
rods
Crystal structure
kinetic energy
Metals
Modulation
occurrences
modulation
X rays
Crystals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Spontaneous distortion via the appearance of ferromagnetism in Pd ultrathin films : Observation of an inverse mechanism for the Stoner criterion. / Sakuragi, Shunsuke; Tajiri, Hiroo; Kageshima, Hiroyuki; Sato, Tetsuya.

In: Physical Review B, Vol. 97, No. 21, 214421, 18.06.2018.

Research output: Contribution to journalArticle

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